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
The atachment site of DNA dependent RNA polymerase to a gene is the - 
Select and explain. 
A. Operator, B. Promoter, C. Structural gene, D. Regulatory gene
B: Promoter
Answer: B: Promoter 
Explanation: B i.e. Promoter