This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid, Subject name: Surgery
A young patient has a midline, tender swelling in neck occurring after an attack of sore throat. The diagnosis is: 
Select and explain. 
A. Acute thyroiditis, B. Thyroglossal cyst, C. Subacute thyroiditis, D. Toxic goiter
C: Subacute thyroiditis
Answer: C: Subacute thyroiditis 
Explanation: Diagnosis in this case is acute thyroiditis. Acute thyroiditis is preceded by respirstory symptoms like sore throat and in young patient.