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': 'Which is not secreted by placenta ? \nSelect and explain. \nA. HPL, B. HCG, C. Prolactin, D. Progesterone', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Prolactin', 'role': 'assistant'}]