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: Microbiology
[{'content': 'Most common cause of diarrhea in infants and children is: March 2013 \nSelect and explain. \nA. Staphylococcus, B. Streptococcus, C. E. coli, D. Rotavirus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D i.e. Rotavirus', 'role': 'assistant'}]