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
Which of the following microbes is the most common cause of gastroenteritis in children? 
Select and explain. 
A. Reoviruses., B. Picornaviruses., C. Togaviruses., D. Paramyxoviruses.
A: Reoviruses.
Answer: A: Reoviruses. 
Explanation: The most common cause of gastroenteritis in children is the rotavirus. It is found in the reovirus family.