<prompt> Characteristic of primary chancre:1988Painless punched out ulcerPainless ulcer with over hanging edgesPainless ulcer with irregular raised edgesPainful punched out ulcer  <response>: Ans: a Painless punched out ulcerRef: Ananthanarayan Micro, 7th ed, p. 379 6th ed, p. 350, Harrison, 16thed, p. 979 15th ed, p. 1048 