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 for: \nSelect and explain. \nA. Fasciola, B. Leishmania, C. Toxoplasma, D. Toxocara', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Leishmania', 'role': 'assistant'}]