( Examples ( of ( Psychoactive Drugs ) ) )
(ROOT (NP (NP (NNS Examples)) (PP (IN of) (NP (NNP Psychoactive) (NNPS Drugs)))))
Examples of Psychoactive Drugs
(ROOT (S (NP (NN Caffeine) (CC and) (NN alcohol)) (VP (VBP are) (NP (NP (CD two) (NNS examples)) (PP (IN of) (NP (DT a) (NN psychoactive))))) (. .)))
Caffeine and alcohol are two examples of a psychoactive.