This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually transmitted diseases, Subject name: Dental
Hard chancre is seen in 
Select and explain. 
A. Chancroid, B. Syphilis, C. Tularemia, D. All
B: Syphilis
Answer: B: Syphilis 
Explanation: <p>PRIMARY SYPHILIS:- Primary chancre is a single,well circumscribed,painless ulcer with a clean floor and hard,indurated base on palpation. Hence it is called hard chancre. Occurs in genitals,perineal/perianal areas. Kissing ulcers can occur on the urethral meatus and coronal sulcus. An ulcer at the hilt of the shaft is called condom chancre. Extragenital sites include rectum , lips,oral mucosa, face, breasts etc.. Treatment- benzyl penicillin injection 2.4 million units i.m 1 dose. Or Inj. Procaine penicillin 12 lakh units i.m for 10 days. If allergic to penicillin- use doxycycline. {Reference: IADVL textbook of dermatology, vishalakshi Vishwanath pg no.126.}</p>