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: 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: Ans. is 'c' i.e., Ethical consideration o Methods to eliminate confounding factors i) Randomization (Best) iii) Matching v) Stastical modeling ii) Restriction iv) Stratification Methods to eliminate bias i) Randomization ii) Blinding