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
Interdental papilla protruding from the rubber dam, most common cause is 
Select and explain. 
A. Inflammation of interdental papillae, B. Use of light weight rubber dam, C. Punch are placed too far, D. Punch are placed too close
D: Punch are placed too close
Answer: D: Punch are placed too close 
Explanation: None