This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Surgery
[{'content': 'EGFR antagonist, Cetuximab is used in cases of \nSelect and explain. \nA. Palliative treatment of head and neck cancer, B. Anal canal carcinoma, C. Gastric carcinoma, D. Small cell lung carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cetuximab and pemtumomab are directed against the epidermal growth factor receptor (EGFR), a transmembrane glycoprotein involved in signaling pathways affecting growth and proliferation of tumor cells. Both cetuximab and pemtumomab, when given alone, have been shown to benefit a small propoion of previously treated patients', 'role': 'assistant'}]