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 represents the mechanism of action of Eternacept? \nSelect and explain. \nA. Blocking tumor necrosis factor, B. Blocking bradykinin synthesis, C. Blocking cyclo-oxygenase-2, D. Blocking lipoxygenase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Etanercept is a fusion protein of TNFRII and the Fc region of IgG1, that binds to TNF and prevent the molecule from interacting with its two receptors, TNFRI and TNFRII, thereby stopping signaling events. TNF is involved in inflammatory and immune responses. Etanercept can also modulate biologic responses regulated by TNF. Ref: Handbook of Dermatologic Drug Therapy By Steven R. Feldma, Page 76', 'role': 'assistant'}]