This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
Confounding factor can be eliminated by- 
Select and explain. 
A. Correlation, B. Standardization, C. Randomization, D. Matching
D: Matching
Answer: D: Matching 
Explanation: . a "confounding factor"is defines as one which is associated both with exposure and disease and is distributed unequally in study and control groups.a cofounding factor by itself is a risk factor for the disease independently of any association.which can be eliminated mainly by matching. ref:park&;s textbook,ed22,pg no 63