This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Infective diarrhea is caused by - \nSelect and explain. \nA. Rontavirus, B. Calcivirus, C. Flavivirus, D. Enterovirus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: viruses causing diarrhoea rotavirus ,astrovirus ,adenovirus ,calcivirus ,coronavirus ,norwalk group virus ,entero virus cytomegalovirus _(community medicine,park edition 23,page>222)', 'role': 'assistant'}]