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: Unknown
[{'content': 'An adult male presented 4 weeks after intercourse with fever, rubbery ulcer, inguinal lymphadenopathy. Causative organism: \nSelect and explain. \nA. LGV, B. Syphillis, C. Chancroid, D. HIV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) LGVRef: Neena Khanna Synopsis of Dermatology 4th ed./322*LGV is an STD, caused by chlamydia presents classically with painless lymphadenopathy.*Mnemonic to remember LGV:# ABCDEFG: Asymptomatic, Bubo, Chlamydia, Doxy, Esthiomine, Fries test, Groove signDiseaseUlcerLymph nodeSyphilisPainlessPainlessChancroidPainfulPainfulLGVPainlessPainful (Bubo)', 'role': 'assistant'}]