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: Unknown
[{'content': 'Which of the following helminths primarily pro¬duces gastrointestinal symptoms, without lung involvement, during the course of its infection? \nSelect and explain. \nA. Dirofilaria immitis, B. Strongyloides stercoralis, C. Trichuris trichiura, D. Ascaris lumbricoides', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]