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
Infective diarrhea is caused by - 
Select and explain. 
A. Rontavirus, B. Calcivirus, C. Flavivirus, D. Enterovirus
A: Rontavirus
Answer: A: Rontavirus 
Explanation: viruses causing diarrhoea rotavirus ,astrovirus ,adenovirus ,calcivirus ,coronavirus ,norwalk group virus ,entero virus cytomegalovirus _(community medicine,park edition 23,page>222)