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: Surgery
The commonest cause of acute mesentric adenitis is - 
Select and explain. 
A. Tuberculosis, B. Brucellosis, C. Pneumococcal infection, D. Idiopathic
D: Idiopathic
Answer: D: Idiopathic 
Explanation: Ans. is 'd' i.e., Idiopathic