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: Surgery
[{'content': 'Commonest site involved in lleocaecal T.B. \nSelect and explain. \nA. Intestinal wall, B. Lymph node, C. Mesentery, D. Intestinal mucosa', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]