Task: Class Definition Understanding (ontology: Sciences/Biology)

Which of the following definitions best describes 'recreational drug'?

A. A drug that acts as an antagonist, agonist, reverse agonist, or in some other fashion when interacting with cellular receptors.
B. A drug used for personal enjoyment rather than for medicinal purposes.
C. A loosely defined category of recreational drugs which are associated with discothèques in the 1970s and nightclubs, dance clubs, electronic dance music parties, and raves from the 1980s to today.
D. Any substance introduced into a living organism with therapeutic or diagnostic purpose.

Answer: A drug used for personal enjoyment rather than for medicinal purposes.