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: Pathology
[{'content': "Crohn's disease \nSelect and explain. \nA. has oral ulcerations similar to major apthous ulcerations, B. is a self limiting Lesion, C. is commonly seen among Indian population, D. is usually treated with Erythromycin", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]