<prompt> Incubation period of syphilis:1 hour - 5 hours24 hours - 48 hours1 day-10 days10 days - 90 days  <response>: Ans. is d i.e., 10 days-90 daysRef: Ananthanarayan, 9the,p 370 and 372; Harrison, 18the, p. 381, 382 and 19the, p. 1132IP - 9-90 days 