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: Medicine
[{'content': 'A 45 year old lorry driver from Bihar presented with multiple necrotic ulcer which are painful on the penis. Tender inguinal lyphadenopathy was also present. What is the diagnosis ? \nSelect and explain. \nA. H. ducreyi, B. Herpes simplex, C. Syphilis, D. Chlamydia infection', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Chancroid is a sexually transmitted infectious disease characterized by painful genital ulcers, bubo formation, and painful inguinal lymphadenopathy. The causative organism is Haemophilus ducreyi. It is a gram-negative, fastidious, facultative, anaerobic coccobacillus. It is usually located in the extracellular spaces and is strictly a human pathogen.', 'role': 'assistant'}]