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: Medicine
[{'content': "Chaga's disease does not involve - \nSelect and explain. \nA. Pancreas, B. Duodenum, C. Esophagus, D. Colon", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]