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
The Lab investigation of patient shows ↓T3, ↓T4,& ↓TSH. It can not be - 
Select and explain. 
A. Primary hypothyrodism, B. Pan - hypopitutarism, C. Liver disease, D. None of the above
A: Primary hypothyrodism
Answer: A: Primary hypothyrodism 
Explanation: None