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
Which cox wont grow in egg, animal cells ? 
Select and explain. 
A. Cow pox, B. Vaccinia, C. Variola, D. Molluscum
D: Molluscum
Answer: D: Molluscum 
Explanation: Ans. is 'd' i.e., Molluscum Humans are the only susceptible hosts for molluscum contagiosum virus. The virus cannot be grown in eggs, tissue cultures or animals. Vaccinia virus may be grown in wide range of animals. Variola can be grown in monkey. Cowpox virus, as the name suggests, infects cow; and also humans.