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
Which of the following is found in primary hypothyroidism - 
Select and explain. 
A. T3 decrease, T4 decrease, TSH increase, B. T3 decrease, T4 increase, TSH decrease, C. T3 normal, T4 normal, TSH increase, D. T3 decrease, T4 decrease, TSH normal
A: T3 decrease, T4 decrease, TSH increase
Answer: A: T3 decrease, T4 decrease, TSH increase 
Explanation: None