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 factors can be eliminated by all except 
Select and explain. 
A. Matching, B. Randomization, C. Ethical consideration, D. Stratification
C: Ethical consideration
Answer: C: Ethical consideration 
Explanation: A confounding factor is defined as one which is associated with both exposure and disease and is distributed unequally in study and control groups. (refer pgno:72 park 23 rd edition)