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': 'A 56 year old female presented with breast carcinoma and she was prescribed herceptin (trastuzumab). Which of the following statements regarding this drug is true ? \nSelect and explain. \nA. It is an antibody produced entirely from mouse containing no human component., B. It is a monoclonal antibody produced by injecting her2 antigen., C. It is a polyclonal antibody, D. It is a monoclonal antibody containing only human component', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]