This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteria, Subject name: Microbiology
[{'content': 'Lymphogranuloma venereum (LGV) is caused by: \nSelect and explain. \nA. Chlamydia trachomatis, B. G. donovani, C. Madura mycosis, D. Herpes genitalis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Chlamydia trachomatisLGV is an invasive STD, caused by C. trachomatis Serovars L1, L2 and L3, characterized by:MC serotype by L2>L1, L3LGV serotypes are more invasive than others.Incidence is falling, Male: female=3.4:1Clinical features:Pain less Ulcer+Painful lymph nodes (Enlarged inguinal Lymph node called Bubo).Esthiomene (elephantiasis of vulva) rectal stricture, proctitis.Skin test positive - Frie test', 'role': 'assistant'}]