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
[{'content': 'Protozoa associated with megaesophagus - \nSelect and explain. \nA. Trypanosome, B. Ameba, C. Giardia, D. Gnathostoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Trypanosomes haemoflagellates Live in the blood tissue of their host Produce disease in animals and humans (refer pg no:44 baveja 3 rd edition)', 'role': 'assistant'}]