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 of the following are intracellular - \nSelect and explain. \nA. Virus, B. Chlamydia, C. Rickettsia, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'a' i.e., Virus; 'b' i.e., Chlamydia; 'c'i.e., Rickettsia", 'role': 'assistant'}]