This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Following hormones secreted by placenta exclusively :a) HCGb) Estrogenc) HPLd) PRL \nSelect and explain. \nA. a, B. bc, C. ac, D. b', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Placenta produces a number of hormones.', 'role': 'assistant'}]