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': 'True about primary chancre: \nSelect and explain. \nA. Painless ulcer, B. Painless lymphadenopathy, C. Covered with exudate, D. All', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. d. AllPRIMARY SYPHILISPrimary (or hard) chancre: Single painless indurated ulcer. Most common sites are penis (in males), Cervix or labia (In female).Regional (Usually inguinal) lymphadenopathy: Painless firm, non-suppurative and often bilateral.If syphilis acquired by non-venereal mode:If transmitted by direct contact - the primary chancre is extra genital, usually on the fingers.If transmitted by blood transfusion - the primary chancre doesn't occur.", 'role': 'assistant'}]