This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Lymphogranuloma venereum is caused by 
Select and explain. 
A. Chlamydia trachomatis, B. Calymmatobacterium granulomatis, C. Haemophilus ducreyi, D. Treponema pallidum
A: Chlamydia trachomatis
Answer: A: Chlamydia trachomatis 
Explanation: .