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: Dental
Which of the following gingival retraction cord is used in hypertensive patient? 
Select and explain. 
A. Plain retraction cord, B. Retraction cord with 2% racemic epinephrine, C. Retraction cord with 8% aluminium chloride, D. None of the above
C: Retraction cord with 8% aluminium chloride
Answer: C: Retraction cord with 8% aluminium chloride 
Explanation: None