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
True about primary chancre: 
Select and explain. 
A. Painless ulcer, B. Painless lymphadenopathy, C. Covered with exudate, D. All
D: All
Answer: D: All 
Explanation: 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.