This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Systemic Bacteriology (Gram Positive Bacilli, Gram Negative Bacilli), Subject name: Microbiology
[{'content': 'Most common cause of diarrhea in children of developing countries is: \nSelect and explain. \nA. EHEC, B. ETEC, C. EAEC, D. EIEC', 'role': 'user'}, {'content': "Answer: B \nExplanation: ETEC Most frequent bacterial cause of diarrhea in children of developing countries. Most common cause of traveler's diarrhea. EPEC Cause infantile diarrhea (outbreaks) Rarely sporadic diarrhea in adults.", 'role': 'assistant'}]