This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid Gland, Subject name: Surgery
[{'content': 'Most sensitive method to diagnose thyroid function is: \nSelect and explain. \nA. T3, B. T4, C. TSH, D. Thyroglobulin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (c) TSHRef: Bailey and Love Principles and Practice of Surgery, 26th ed p-743* Most sensitive and specific test to detect hypothyroidism and hyperthyroidism is TSH ASSAY* Total T4: Reflects output from thyroid gland* Total T3: More indicative of peripheral thyroid metabolism, hence not useful for screening', 'role': 'assistant'}]