Which drug is least likely to cause a fatal overdose

A)  heroin 
B)  cocaine 
C)  barbiturates 
D)  LSD

Fatal Overdose

An excessive and lethal dose of a substance, typically drugs or medication, leading to death.

Heroin

Is an opioid drug made from morphine, a natural substance taken from the seed pod of various opium poppy plants, highly addictive and illegal.

Cocaine

A powerful stimulant drug derived from the leaves of the coca plant, known for its potential for addiction and abuse.