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': 'All of the following are general properties of Viruses except - \nSelect and explain. \nA. May contain both DNA and RNA, B. Form extracellular infectious particles, C. Heat labile, D. Not affected by antibiotics', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Properties of viruses \n\nViruses are obligate intracellular parasites\nThey lack enzymes necessary for protein and nucleic acid synthesis and are dependent for replication on the synthetic machinery of host cells → so, they cannot grow in cell-free culture media.\nThey do not have a cellular organization.\nThey are unaffected by antibacterial antibiotics.\nThey contain only one type of nucleic acid, either RNA or DNA, never both.\nThey multiply by a complex process and not by binary fission.\nThe extracellular infectious virus particle is called the virion.\nWith few exceptions, viruses are very heat labile.', 'role': 'assistant'}]