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
LGV (lymphogranuloma venerum) is caused by ? 
Select and explain. 
A. Treponema pallidum, B. Chlamydia trachomatis, C. Calymmatobacter granulomatosis, D. H Ducreyi
B: Chlamydia trachomatis
Answer: B: Chlamydia trachomatis 
Explanation: Ans. is 'b' i.e., Chlamydia trachomatis