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
[{'content': "Which pox virus won't grow in egg, animal cells - \nSelect and explain. \nA. Cow pox, B. Vaccinia, C. Variola, D. Molluscum", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Humans are the only susceptible hosts for molluscum contagiosum virus. The virus cannot be grown in eggs, tissue cultures or animals.\nVaccinia virus may be grown in a wide range of animals.\nVariola can be grown in the monkey.\nCowpox virus, as the name suggests, infects cow; and also humans.', 'role': 'assistant'}]