The british government classifies the highly addictive crystallized form of as one of the mostdangerous of drugs.

a. thc
b. melatonin
c. cortisol
d. methamphetamine

Letter D is the correct answer.

Methamphetamine, also referred to as Crystal, Crank or Ice, is considered by the British government one of the most dangerous of drugs. Differently from other drugs, meth is cheap to buy since it can be made by anyone. It also keeps you high from 6 to 12 hours. This drug can be either swallowed, snorted, smoked or injected and creates feelings such as euphoria, invulnerability, and paranoia. Methamphetamines also cause brain damage, insomnia and loss of appetite.