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
Which of the following are situated away from the coding region? 
Select and explain. 
A. Promoter, B. Enhancer, C. Operator, D. all of the above
D: all of the above
Answer: D: all of the above 
Explanation: promoter gene, operator gene, regulatory gene (enhancer/repressor), are present away from coding region.