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
Total T3 T4 and TSH all decrease in 
Select and explain. 
A. Primary hypothyroidism, B. Hypopituitarism, C. Nephrotic syndrome, D. Pregnancy
B: Hypopituitarism
Answer: B: Hypopituitarism 
Explanation: (B) Hypopituitarism