The drug of choice for syphilis treatment is

Choice A reason: This is incorrect. Decreased production of erythrocytes (red blood cells) is a consequence, not a cause, of iron deficiency anemia. Iron is needed to make hemoglobin, the protein that carries oxygen in the red blood cells. Without enough iron, the body cannot produce enough hemoglobin or red blood cells¹.

Choice B reason: This is correct. Inadequate intake of iron is the most common cause of iron deficiency anemia during pregnancy. Pregnant women need more iron than nonpregnant women to support the increased blood volume and the fetal growth. If the dietary intake of iron is not sufficient, the body will use up its iron stores, leading to iron deficiency anemia.

Choice C reason: This is incorrect. Dilution of hemoglobin concentration is a normal physiological change during pregnancy, not a cause of iron deficiency anemia. The blood volume increases by 20% to 30% during pregnancy, while the red blood cell mass increases by only 15% to 20%. This results in a lower concentration of hemoglobin in the blood, but not necessarily a lower amount of hemoglobin or iron³.

Choice D reason: This is incorrect. The fetus establishing iron stores is not a cause of iron deficiency anemia during pregnancy, although it can contribute to it. The fetus needs iron for its own development and growth, and it obtains iron from the mother through the placenta. The fetal iron demand increases in the second and third trimesters, when the fetus accumulates iron in its liver and other tissues. This can deplete the maternal iron stores, especially if the mother does not consume enough iron.

Choice A reason: The incidence of hepatitis C is not decreasing, but rather increasing, especially among young people who inject drugs. Hepatitis C is a chronic infection that can lead to liver damage and cancer.

Choice B reason: Hepatitis B is more contagious than HIV, as it can be transmitted by blood, semen, vaginal fluids, and other body fluids. Hepatitis B can also cause chronic infection and liver problems.

Choice C reason: A vaccine exists for hepatitis B but not for hepatitis C. Hepatitis B vaccine is recommended for all infants, children, and adults who are at risk of exposure. Hepatitis C vaccine is still under development.

Choice D reason: Hepatitis A is caused by eating contaminated food or drinking polluted water. It is an acute infection that usually resolves on its own. Hepatitis A vaccine is available for travelers and people who live in areas with poor sanitation.