This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Considerations - Infectious Diseases, Subject name: Pediatrics
Most common cause of neonatal diarrhea worldwide is: 
Select and explain. 
A. Rotavirus, B. Adenovirus, C. Norwalk virus, D. Cholera
A: Rotavirus
Answer: A: Rotavirus 
Explanation: a. Rotavirus(Ref: Nelson's 20/e p 1616)In early childhood, the single most important cause of severe dehydrating diarrhea is rotavirus infection.