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
False about osmotic diarrhea 
Select and explain. 
A. Stool volume decreasing with fasting, B. Normal stool osmotic gap, C. Celiac sprue cause osmotic diarrhea, D. All the above
B: Normal stool osmotic gap
Answer: B: Normal stool osmotic gap 
Explanation: Osmotic diarrhea - increased stool osmotic gap.