This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Surgery, Subject name: Surgery
A 40 years old female presents with fever, fatigue, diffuse painful swelling in the midline of the neck. FNAC revealed epitheloid cells & giant cells. What is the most likely diagnosis? 
Select and explain. 
A. Acute thyroiditis, B. Subacute thyroiditis, C. Tubercular lymphadenitis, D. Hashimoto's thyroiditis
B: Subacute thyroiditis
Answer: B: Subacute thyroiditis 
Explanation: Subacute Thyroiditis Aka DE QUERVAIN'S thyroiditis Aka Viral thyroiditis Aka Granulomatous thyroiditis Aka Giant cell thyroiditis Characterized byUpper respiratory tract infection caused by virus| leading to Granulomatous inflammation | leading toFollicular destruction & giant cell formation Associated with HLA B-35 NSAIDS to control inflammation