This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunomodulator, Subject name: Pharmacology
[{'content': 'Etanercept is a biological disease-modifying agent used in the management of rheumatoid arthritis. Its mechanism of action is: \nSelect and explain. \nA. TNF alpha blockade, B. COX-2 inhibition, C. IL-6 inhibition, D. Stabilization of mast cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A) TNF alpha blockade(Ref: KDT 8th/e p943)TNF alpha blocking drugs are used in rheumatoid arthritis and Crohn disease. These include*Adalimumab*Certolizumab*Etanercept*Infliximab*Golimumab', 'role': 'assistant'}]