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
Protozoa associated with megaesophagus - 
Select and explain. 
A. Trypanosome, B. Ameba, C. Giardia, D. Gnathostoma
A: Trypanosome
Answer: A: Trypanosome 
Explanation: Trypanosomes haemoflagellates Live in the blood tissue of their host Produce disease in animals and humans (refer pg no:44 baveja 3 rd edition)