This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Salivary Gland), Subject name: Surgery
Most common cause of acute parotitis - 
Select and explain. 
A. S. Aureus, B. S. Pneumonia, C. Klebsiella, D. S.Viridans
A: S. Aureus
Answer: A: S. Aureus 
Explanation: Ans. is 'a' i.e., Staph Aureus o MC organism is staph aureus >> str. viridans >> pneumococcus.