True about chancroid is: (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.
Answer is C. Chancroid:

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