This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal tract, Subject name: Pharmacology
Which one of the drugs is useful in treating Crohn's disease? 
Select and explain. 
A. Infliximab, B. Azathioprine, C. Tacrolimus, D. Cyclosporine
A: Infliximab
Answer: A: Infliximab 
Explanation: drug used in CrD are a)5ASA compound b)coicosteroid c)immuno suppressent d)TNalpha inhibitors(infliximab) ESSENTIALS OF MEDICAL PHARMACOLOGY SEVENTH EDITION KD TRIPATHI PG NO.683,685