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
A female patient has TSH elevated above normal and subnormal free T4. What is the likely diagnosis? 
Select and explain. 
A. Primary hypothyroidism, B. Secondary hypothyroidism, C. Hypehyroidism, D. Subclinical hypothyroidism
A: Primary hypothyroidism
Answer: A: Primary hypothyroidism 
Explanation: Answer- A. Primary hypothyroidismElevated TSH with decreased T3/74 in the patient is suggestive of primary hypothyroidism"