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': 'After 8 weeks of visit to female sex worker male patient develops painless ulcer over penis that bleeds on touch without any lymphadenopathy, diagnosis is? \nSelect and explain. \nA. Primary Syphilis, B. Chanchroid, C. Herpes simplex virus, D. Donovanosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Donovanosis (Granuloma Inguinale ) Chronic, progressively destructive bacterial infection of the genital region caused by K. granulomatis. Intracellular, gram-negative, pleomorphic, encapsulated bacterium. Genital ulcers: Single Base is beefy red, bleeds easily and painless. Indurated and elevated margins', 'role': 'assistant'}]