This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Which of the following is not a sexually transmitted disease 
Select and explain. 
A. Hepatitis B, B. Amoebiasis, C. Bacterial vaginosis, D. Yaws
D: Yaws
Answer: D: Yaws 
Explanation: 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 paniker's; 10th edition; Pg:384.