Drugs such as barbiturates, methaqualone are
a. depressants.
b. hallucinogens.
c. narcotics.

A. depressants.

Depressants are drugs that affect the central nervous system. This drug when ingested, breaks down inside the body and is absorbed in the bloodstream, which then travels to the brain. As a result motor skills of a person are affected. These are commonly prescribed by psychiatrists who treat patients that have obsessive compulsive behaviors. It is also usually administered to patients in mental clinics to suppress their aggressive and destructive behaviors. 

Difference between normal and abnormal tissue is much clearer on mri than on ct and mri much suitable to view soft tissues

Cis the most source of vitamins