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
Cavett test is used for detection of 
Select and explain. 
A. Opiates, B. Alcohol, C. Barbiturates, D. Cocaine
B: Alcohol
Answer: B: Alcohol 
Explanation: Test for alcohol :

Cavett test
Kozelka and thine test
Alcohol dehydrogenase test
Gas chromatography (Most specific)