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: Anatomy
[{'content': '"Sub mucosal" glands are present in which one of the following organs? \nSelect and explain. \nA. Duodenum, B. Colon, C. Anal canal, D. Stomach', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Duodenum', 'role': 'assistant'}]