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
All are features of irritable bowel syndrome except - 
Select and explain. 
A. Vomiting, B. Pain abdomen, C. Diarrhoea, D. Constipation
A: Vomiting
Answer: A: Vomiting 
Explanation: None