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: Pharmacology
The most common side effect of the oral administration of ampicillin is 
Select and explain. 
A. Anaphylactic shock, B. Diarrhoea, C. Oral candidiasis, D. Renal failure
B: Diarrhoea
Answer: B: Diarrhoea 
Explanation: None