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: Forensic Medicine
Widmark's formula is used for measurement of blood levels of: NIMHANS 10; AFMC 11 
Select and explain. 
A. Benzodiazepines, B. Barbiturates, C. Alcohol, D. Cocaine
C: Alcohol
Answer: C: Alcohol 
Explanation: Ans. Alcohol