This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Bio-Chemistry), Subject name: Biochemistry
[{'content': 'Total T3 T4 and TSH all decrease in \nSelect and explain. \nA. Primary hypothyroidism, B. Hypopituitarism, C. Nephrotic syndrome, D. Pregnancy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (B) Hypopituitarism', 'role': 'assistant'}]