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
The virus with smallest genome is ? 
Select and explain. 
A. Reovirus, B. Parvovirus, C. Picornavirus, D. HIV
B: Parvovirus
Answer: B: Parvovirus 
Explanation: Ans. is 'b' i.e., Parvovirus . Smallest genome ----> Parvovirus . Largest genome --> Poxvirus