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': 'The best marker to diagnose thyroid related order is - \nSelect and explain. \nA. T3, B. T4, C. TSH, D. Thyroglobulin', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]