This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology metabolism, Subject name: Physiology
[{'content': 'LH is secreted by - \nSelect and explain. \nA. Ovary, B. Pituitary, C. Corpus luteum, D. Hypothalamus', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Pituitary", 'role': 'assistant'}]