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: Pharmacology
[{'content': "Which of the following is not used in Crohn's disease? \nSelect and explain. \nA. Infliximab, B. Adalimumab, C. Ustekinumab, D. Natalizumab", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Ustekinumab Immumodulators used in Crohn's disease :- i) Anti-TNF-a : Infliximab, adalimumab, ceolizumbab ii)Anti-Integrin therapy : Natalizumab", 'role': 'assistant'}]