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
Which of the following helminths primarily pro¬duces gastrointestinal symptoms, without lung involvement, during the course of its infection? 
Select and explain. 
A. Dirofilaria immitis, B. Strongyloides stercoralis, C. Trichuris trichiura, D. Ascaris lumbricoides
C: Trichuris trichiura
Answer: C: Trichuris trichiura 
Explanation: None