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: Medicine
Which is the commonest complication of Mumps in adults ? 
Select and explain. 
A. Encephalitis, B. Orchitis, C. Pancreatitis, D. Carditis
B: Orchitis
Answer: B: Orchitis 
Explanation: Meningoencephalitis is common in children. Unilateral deafness and thyroiditis are also known complication.