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
In lac operon, transcription is inhibited by binding into ? 
Select and explain. 
A. Promotor site, B. Operator site, C. CAP site, D. None of the above
B: Operator site
Answer: B: Operator site 
Explanation: Ans. is 'b' i.e., Operator siteRepressor binds to this site and blocks transcription.