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
Ascaris is a: 
Select and explain. 
A. Nematode, B. Cestode, C. Protozoa, D. Trematode
A: Nematode
Answer: A: Nematode 
Explanation: Nematode