This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually Transmitted Infections, Subject name: Dental
[{'content': 'The most frequent cause of recurrent genital ulceration in a sexually active male is: \nSelect and explain. \nA. Herpes genitalis, B. Aphthous ulcer, C. Syphilis, D. Chancroid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sexually transmitted herpes simplex virus type II(HSV) infections cause most genital ulcer disease. Disease % Herpes 62 % Chanchroid 12 to 20 % Syphilis 13 % LGV and Granuloma Inguinale 5% Herpes ulcers are painful, vesicular, multiple and are associated with firm tender lymphadenopathy.', 'role': 'assistant'}]