A syndrome found in long-term cannabis users characterized by apathy, lack of pursuit of vocational goals, self-absorption, and detachment from family and friends is known as

A) cannabis sativa.
B) amotivational syndrome.
C) toxic psychosis.
D) abnormal cannabis reaction.
E) unusual dependency.

The syndrome described is known as amotivational syndrome, which is commonly found in long-term cannabis users. The other options are not correct as cannabis sativa refers to the type of plant, toxic psychosis is a severe mental disorder caused by drug use, abnormal cannabis reaction is not a recognized syndrome, and unusual dependency is not a specific term related to cannabis use.