This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peptic Ulcer Disease, Subject name: Medicine
The most common complication of vagotomy is: 
Select and explain. 
A. Diarrhoea, B. Dryness of mouth, C. Tachycardia, D. Bleaching
A: Diarrhoea
Answer: A: Diarrhoea 
Explanation: Postvagotomy diarrhea- most commonly observed after truncal vagotomy Due to a motility disorder from interruption of the vagal fibers supplying the luminal gut. Other factors may include decreased absorption of nutrients, increased excretion of bile acids, release of luminal factors that promote secretion. Diphenoxylate or loperamide is often useful in symptom control.