This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is not a STD? \nSelect and explain. \nA. Trichomoniasis, B. Giardiasis, C. Amoebiasis, D. Leishmaniasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Protozoal agents causing STD include: Trichomoniasis Giardiasis Amoebiasis Ref: Park 21st edition, page 304.', 'role': 'assistant'}]