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
Protozoa associated with megaesophagus ? 
Select and explain. 
A. Trypanosome, B. Ameba, C. Giardia, D. Gnathostoma
A: Trypanosome
Answer: A: Trypanosome 
Explanation: Ans. is 'a' i.e., Trypanosoma Megaesophagus and megacolon occur as complications of chronic chagas disease. T. cruzi causes chagas' disease Chaga's disease 1. Acute form - Occurs in infants and children. - Presents with fever, unilateral face swelling, lymphadenopathy, splenomegaly and chagoma (Localized swelling of the skin). 2. Chronic form - Occurs in adolescent and adults - Presents with cardiac arrhythmias and neurological manifestations. - Complications --> megacolon, megaesophagus, cardiomyopathy. Romana's sign When entry of the parasite is through the conjuctiva an edematous swelling of eyelids of one eye develops.