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: Microbiology
8 Year old boy presented with swelling on both
sides of the face, below the ears of 4 days duration.
It first started on the left side and then 3 days later on the right side

Possible diagnosis will be 
Select and explain. 
A. Bacterial sialadenitis, B. Sialadenosis, C. Epidemic parotitis, D. Sialadenitis
C: Epidemic parotitis
Answer: C: Epidemic parotitis 
Explanation: None