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': 'LGV (lymphogranuloma venerum) is caused by ? \nSelect and explain. \nA. Treponema pallidum, B. Chlamydia trachomatis, C. Calymmatobacter granulomatosis, D. H Ducreyi', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Chlamydia trachomatis", 'role': 'assistant'}]