<prompt> Which of the following is not a sexually transmitted diseaseHepatitis BAmoebiasisBacterial vaginosisYaws  <response>: Yaws is caused by Treponema pallidum peenue. Infection is caused by direct contact with open ulcers, flies may act as mechanical vectors. The primary lesion is an extragenital papule that enlarges and breaks down to form an ulcerating granuloma. Ref: Textbook of microbiology; Ananthanarayan and panikers; 10th edition; Pg:384. 