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
All of the following are having lipid envelope except? 
Select and explain. 
A. HIV, B. Rabies virus, C. Varicella, D. Enterovirus
D: Enterovirus
Answer: D: Enterovirus 
Explanation: Ans. is 'd' i.e., Enterovirus