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
Mode:is defined as? 
Select and explain. 
A. Average of the values, B. Relating to a value or quantity lying at the midpoint of a data after arranging in ascending or descending order, C. Adding up the values and then dividing by the number of values, D. The number which appears most often in a set of numbers
D: The number which appears most often in a set of numbers
Answer: D: The number which appears most often in a set of numbers 
Explanation: None