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
Antiperistalsis is seen in - 
Select and explain. 
A. Distal colon, B. Jejunum, C. Proximal Colon, D. Ileum
A: Distal colon
Answer: A: Distal colon 
Explanation: • Right colon is the fermentation chamber of the human GI tract
• Bacteria are most metabolically active in cecum
• Left colon is a site of storage and dehydration of stool.