This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroiditis, Subject name: Pathology
All of the following are features of De quervain thyroiditis except: 
Select and explain. 
A. In early phase follicles are disrupted and replaced by neutrophils forming microabscesses, B. Inflammatory infiltrate composed of lymphocyte, plasma cell, macrophages with granuloma formation, C. Bacterial infection is a trigger in most patients, D. It is the most common cause of painful thyroid
C: Bacterial infection is a trigger in most patients
Answer: C: Bacterial infection is a trigger in most patients 
Explanation: Subacute Granulomatous (de Quervain) thyroiditis: - Self-limited disease, probably secondary to viral infection & is characterized by presence of painful & granulomatous inflammation in thyroid. - It is MCC of tender thyroid - Lab findings : increased serum T4, decreased TSH, decreased radioiodine uptake - Early stages of De Quervain thyroiditis shows - micro abscesses formation - Late stages - granuloma formation - Rx - NSAID's