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': 'Ascaris lumbricoides is: \nSelect and explain. \nA. Ascaris lumbricoides is:, B. Cestode, C. Protozoa, D. Trematode', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nematode', 'role': 'assistant'}]