This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'Dihydrotestosterone acts on \nSelect and explain. \nA. Pituitery, B. Extermal genitalia, C. Internal genitalia, D. Testis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref; Ganong&;s review of medical physiology; 24th edition; page no:-425Dihydrotestosterone (commonly abbreted to DHT), or 5a-dihydrotestosterone (5a-DHT), also known as androstanolone (5a-androstane-17b-ol-3-one) as well as 17b-hydroxy-5a-androstane-3-one, is a sex steroid and androgen hormone. The enzyme 5a-reductase synthesizes DHT in the prostate, testes, hair follicles, and adrenal glands. This enzyme reduces the 4,5 double-bond of the hormone testosterone. During embryogenesis, DHT has an essential role in the formation of the male external genitalia, while in the adult DHT acts as the primary androgen in the prostate and in hair follicles.', 'role': 'assistant'}]