This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Infectious Diseases, Subject name: Pediatrics
Parotitis and orchitis are common manifestations of: 
Select and explain. 
A. Diphtheria, B. Measles, C. Rubella, D. Mumps
D: Mumps
Answer: D: Mumps 
Explanation: d. Mumps(Ref: Nelsons' 20/e p 1552-1553, Chai 8/e p 217-218)Mumps is characterized by fever, bilateral or unilateral parotid swelling and tenderness, and the frequent occurrence of meningoencephalitis and orchitis.