This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T., Subject name: Medicine
[{'content': "Which among the following is an example for Inflammatory bowel disease \nSelect and explain. \nA. Irritable bowel syndrome, B. Tropical sprue, C. Whipple's disease, D. Crohn's disease", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: d) Crohn\'s disease [Ref: Harrison 17th / Pg 1886"Ulcerative colitis and Crohn\'s disease are the two major types of IBD".* Smoking and OCP increase the risk of Crohn\'s disease* Appendicectomy and smoking protects Ulcerative colitis* P-ANCA: 60-70% of ulcerative colitis* ASCA : 60 - 70% of Crohn\'s disease* If +ve, chance of early complication* Omp - C: 55% of Crohn\'s disease (if +ve perforating disease)* Antibody to I2:50% of Crohn\'s disease (if +ve fibro stenosing disease)', 'role': 'assistant'}]