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
Diagnosis of rotavirus is by: 
Select and explain. 
A. Stool antigen, B. Stool antibody, C. Stool culture, D. Blood antibody
D: Blood antibody
Answer: D: Blood antibody 
Explanation: Ans. d. Blood antibody