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: Surgery
[{'content': 'On thyroid function test, TSH value is raised and\nt4 value is decreased. Referred diagnosis is \nSelect and explain. \nA. Hyperthyroidism, B. Primary hypothyroidism, C. Secondary hypothyroidism, D. Subclinical hypothyroidism', 'role': 'user'}, {'content': 'Answer: B \nExplanation: IF TSH raised ans T4 is decreased then its primary.\nIF both are decreased then its secondary.', 'role': 'assistant'}]