This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
The smallest intestinal adult nematode is 
Select and explain. 
A. Enterobius vermicularis, B. Necator americanus, C. Strongyloides stercoralis, D. Trichuris trichiura
C: Strongyloides stercoralis
Answer: C: Strongyloides stercoralis 
Explanation: Strongyloides stercoralis has the most complex life cycle of all the intestinal nematodes--and the greatest risk of acute, overwhelming infection. The adults measure only 2 mm in length, making them the smallest of the intestinal nematodes.Ref: Sherris microbiology; 6th edition; Page no: 858