<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:Hormone balance is essential for maintaining a normal pregnancy. Early on, elevated progesterone levels are needed to maintain pregnancy and progesterone is produced in excess by the corpus luteum. In the normal menstrual cycle the corpus luteum involutes, but this process is impeded during pregnancy because of the presence of which hormone?? A: Cortisol, B: Human chorionic gonadotropin, C: Estrogen, D: Progesterone, E: Inhibin A,  <response>: This is a question about hormone balance during pregnancy. The key points in the question stem are:- Hormone balance is important for maintaining pregnancy- Early in pregnancy, high progesterone levels are needed, which are produced by the corpus luteum- Normally the corpus luteum involutes, but this does not happen during pregnancy- This is prevented by the presence of a specific hormoneLooking at the answer choices:- Cortisol is a stress hormone, not related to pregnancy- Human chorionic gonadotropin hCG is produced by the placenta during pregnancy and helps maintain the corpus luteum and progesterone levels- Estrogen levels also increase during pregnancy, but estrogen alone does not maintain the corpus luteum - Progesterone is produced by the corpus luteum, so its presence does not explain why the corpus luteum is maintained- Inhibin A is not a key hormone in early pregnancyBased on this analysis, the hormone that must be present to prevent involution of the corpus luteum is human chorionic gonadotropin hCG.B: Human chorionic gonadotropin 