Which of the following are hormonal methods of contraception? (Select all that apply)

Choice A rationale
Oral contraceptives are often used in the treatment of PCOS to restore menstrual regularity. They do this by regulating the hormonal imbalances that cause the irregular periods seen in PCOS678910.
Choice B rationale
While oral contraceptives can indirectly lead to ovulation in some women with PCOS by regulating their menstrual cycles, they are not typically used to directly induce ovulation. Other medications, such as clomiphene or letrozole, are more commonly used for this purpose.

Choice C rationale
While insulin resistance is a common feature of PCOS, oral contraceptives are not typically used to improve insulin uptake. Other medications, such as metformin, are more commonly used for this purpose.
Choice D rationale
While oral contraceptives can help alleviate hirsutism (excessive hair growth) in women with PCOS by reducing levels of circulating androgens, this is typically considered a secondary benefit rather than the primary rationale for their use.

Choice A is correct. The square window angle, formed by the intersection of the ear and the jawline, is an important physical assessment finding in neonates. In full-term babies, this angle is typically greater than 90 degrees, appearing more rounded. However, in preterm babies, the angle is often closer to 90 degrees, appearing more square due to underdeveloped facial features and subcutaneous tissue.

Choice B is incorrect. While leathery and cracked skin can be present in both term and preterm babies, it's not a specific indicator of prematurity alone. It can be caused by various factors like intrauterine growth restriction, dehydration, or underlying skin conditions.

Choice C is incorrect. The popliteal angle, formed by flexing the knee and measuring the angle between the thigh and lower leg, is not a reliable indicator of prematurity. It can vary even among term babies and is influenced by other factors like muscle tone and positioning.

Choice D is incorrect. Pronounced plantar creases, the lines on the soles of the feet, are also not specific to prematurity. While they may be deeper in some preterm babies, they can also be present in full-term infants and their depth can vary greatly between individuals.