This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sexually Transmitted Disease in the Female, Subject name: Gynaecology & Obstetrics
A 19-year-old girl with painless ulcer in labia majora with everted margins: 
Select and explain. 
A. Treponema pallidum, B. Chlamydia, C. Gonorrhoea, D. Herpes genital ulcer disease
A: Treponema pallidum
Answer: A: Treponema pallidum 
Explanation: Ans. is a, i.e. Treponema pallidumThe M/c causes of genital ulcers in young, sexual active women are:* Herpes simplex virus (HSV)* Treponema pallidum (syphilis)* Haemophilus ducreyi (chancroid).In this case, painless ulcer with everted margin leave no doubt that the cause of the ulcer is syphilis (treponema pallidum).Clinical features of genital ulcers