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: Surgery
Dennis stability concept is based on which of the following 
Select and explain. 
A. 2 columns, B. 3 columns, C. 4 columns, D. 5 columns
B: 3 columns
Answer: B: 3 columns 
Explanation: Ans. b. 3 columns