This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
True about chancroid is 
Select and explain. 
A. Incubation period is 3 to 10 weeks., B. Characterised typically by prodromal symptoms and systemic reaction., C. Painful ulcer with irregular erythematous non-indurated margins., D. Ulcer base is hard, indurated.
C: Painful ulcer with irregular erythematous non-indurated margins.
Answer: C: Painful ulcer with irregular erythematous non-indurated margins. 
Explanation: Chancroid:

Incubation period = 3 to 10 days
It lacks systemic reaction and prodrome.
Ulcer base is soft.