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 
Select and explain. 
A. Value that most frequently occurs in a set of observation, B. When observations are arranged in ascending or descending order the value that comes in the centre, C. Calculated by adding up the values of a group of items and dividing the sum by the number of items, D. Best measure for central tendency in a highly scented distribution
A: Value that most frequently occurs in a set of observation
Answer: A: Value that most frequently occurs in a set of observation 
Explanation: None