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
Which type of blinding is when both Subject as well as Investigator are not aware of treatment being given 
Select and explain. 
A. Single blinding, B. Double blinding, C. Triple blinding, D. No blinding
B: Double blinding
Answer: B: Double blinding 
Explanation: BLINDING IN EPIDEMIOLOGY Single blinding: Subject is not aware of treatment being given Double blinding: Subject & Investigator are not aware of treatment being given (MC) Triple blinding: Subject, Investigator & Analyzer are not aware of treatment being given (Best) No blinding done in the Open trail or study