This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central tendency, Dispersion, Subject name: Social & Preventive Medicine
Calculate degree of freedom Material Location X Y Glass 8 23 Cupboard 56 3 Metal 1 14 
Select and explain. 
A. 1, B. 2, C. 3, D. 4
B: 2
Answer: B: 2 
Explanation: Degree of freedom = (C-1) (R-1) Given rows = 3 ; columns = 2 DOF = (2-1) (3-1) = 1x2 = 2