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: Microbiology
[{'content': 'Aldehyde test is used for: \nSelect and explain. \nA. Fasciola hepatica, B. Leishmania, C. Leishmania, D. Toxocara cams', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leishmania', 'role': 'assistant'}]