<prompt> A 30 year old male patient has a large, spreading and exuberant ulcer with bright red granulation tissue over the glands penis. There was no lymphadenopathy. The most likely causative organism is;Treponema pallidumHerpes simplex virus type 1Herpes simplex virus type 2Calymmatobacterium granulomatis  <response>: D i.e. Calymmatobacterium granulomatis 