<prompt> Painful ulcer on glans penis is seen in:SyphilisLymphogranuloma venerumChancroidChancre  <response>: Ans: c ChancroidRef: Harrison 19th ed. 881, 1134 Chancroid is a bacterial STD caused by H.Ducreyi. It is characterized by painful sores on the genitalia. Chancroid is known to spread from one individual to another solely throueh sexual contact. A chancre on the other hand is a painless ulceration sore most commonly formed during the primary stage of syphilis. 