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
In a Chi - square test for the following data, the degree of freedom will be: 
Select and explain. 
A. 2, B. 4, C. 6, D. 8
A: 2
Answer: A: 2 
Explanation: Degree of freedom  (d.f):
It depends upon the number of columns and rows in the original table.
d.f = (column-1) (row-1)
= (3-1) (2-1)
= 2