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
Not true regarding Irritable bowel syndrome 
Select and explain. 
A. Improvement with defecation, B. Most common is diarrhea followed by constipation, C. Onset associated with a change in frequency of stool, D. Onset associated with a change in form of stool
B: Most common is diarrhea followed by constipation
Answer: B: Most common is diarrhea followed by constipation 
Explanation: Most common is constipation followed by diarrhea.