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': 'True about chlamydia are all except: \nSelect and explain. \nA. Obligate intracellular organism, B. Gram positive, C. Reticulate body is metabolically active, D. Replicate by binary fission', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., Gram positive", 'role': 'assistant'}]