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': 'Cetuximab (an EGFR antagonist) can be used in : \nSelect and explain. \nA. Palliation in head and neck cancer, B. Anal canal carcinoma, C. Gastric carcinoma, D. Lung carcinoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]