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: Medicine
[{'content': 'Investigation of choice of hyper-prolactinemia: \nSelect and explain. \nA. TRH estimation, B. LH estimation, C. Prolactin estimation, D. Estradiol estimation', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Prolactin estimation): Basal fasting morning prolactin levels should be measured to assess hypersecretion - Harrison', 'role': 'assistant'}]