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: Biochemistry
[{'content': 'The atachment site of DNA dependent RNA polymerase to a gene is the - \nSelect and explain. \nA. Operator, B. Promoter, C. Structural gene, D. Regulatory gene', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Promoter', 'role': 'assistant'}]