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 can be eliminated by all except: 
Select and explain. 
A. Matching, B. Randomization, C. Blinding, D. Multivariate analysis
C: Blinding
Answer: C: Blinding 
Explanation: None