When describing the menstrual cycle to a group of young women, the nurse explains that estrogen levels are highest during which phase of the endometrial cycle?

Choice A: Diarrhea is not the correct answer because it is not a common adverse effect of radiation treatment for breast cancer. Diarrhea is a condition that causes loose, watery, or frequent stools. It can be caused by various factors such as infection, medication, or food intolerance. It is more likely to occur as an adverse effect of radiation treatment for cancers that affect the digestive system, such as colorectal or stomach cancer.

Choice B: Anorexia is not the correct answer because it is not a common adverse effect of radiation treatment for breast cancer. Anorexia is a condition that causes loss of appetite or interest in food. It can be caused by various factors such as depression, stress, or nausea. It is more likely to occur as an adverse effect of chemotherapy or other systemic treatments for cancer that affect the whole body.

Choice C: Fatigue is the correct answer because it is a common adverse effect of radiation treatment for breast cancer. Fatigue is a condition that causes extreme tiredness or exhaustion that is not relieved by rest or sleep. It can be caused by various factors such as anemia, inflammation, or pain. It is a common adverse effect of radiation treatment for any type of cancer, as radiation can damage healthy cells and tissues and affect the body's energy production.

Choice D: Alopecia is not the correct answer because it is not a common adverse effect of radiation treatment for breast cancer. Alopecia is a condition that causes hair loss or thinning on the scalp or other parts of the body. It can be caused by various factors such as genetics, hormones, or infection. It is more likely to occur as an adverse effect of chemotherapy or other systemic treatments for cancer that affect the whole body.

Choice A: Breast milk is not the correct answer because it is not a route of transmission for syphilis. Syphilis is caused by a bacterium called Treponema pallidum, which cannot survive in breast milk. However, breastfeeding mothers with syphilis should be treated with antibiotics to prevent other complications.

Choice B: The birth canal is not the correct answer because it is not a route of transmission for syphilis. Syphilis can be transmitted through sexual contact, but not through vaginal delivery. However, pregnant women with syphilis should be screened and treated before delivery to prevent congenital syphilis in their newborns.

Choice C: Amniotic fluid is not the correct answer because it is not a route of transmission for syphilis. Syphilis cannot cross the amniotic membrane, which protects the fetus from infections in the uterus. However, pregnant women with syphilis should be monitored for signs of fetal distress or premature rupture of membranes.

Choice D: Placenta is the correct answer because it is a route of transmission for syphilis. Syphilis can cross the placenta, which connects the mother and the fetus through blood vessels. This can result in congenital syphilis, which can cause serious problems such as stillbirth, miscarriage, low birth weight, deformities, or neurological damage in newborns.