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
Non-enveloped ss-RNA virus is- 
Select and explain. 
A. Picornavirus, B. Poxvirus, C. Retrovirus, D. Bunyavirus
A: Picornavirus
Answer: A: Picornavirus 
Explanation: Non-enveloped RNA viruses → PCR - Picorna, Calci, Reo.