This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Targeted Anticancer Drugs and Immunosuppressants, Subject name: Pharmacology
[{'content': 'Which of the following monoclonal antibody is used for treatment of colorectal carcinoma? \nSelect and explain. \nA. Pembrolizumab, B. Cetuximab, C. Rituximab, D. Natalizumab', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Cetuximab - Colorectal cancer, Head and neck cancer. Rituximab - B cell NHL, CLL Natalizumab - multiple sclerosis Pembrolizumab - head and neck cancer JC virus antibody titre measurement is mandatory during treatment with Natalizumab', 'role': 'assistant'}]