The correct option is
D Hashish causes after thought perceptions and hallucinations.
A. Morphine is a strong sedative and analgesic (pain killer). It acts on central nervous system (CNS).
B. Barbiturates are sedative-hypnotics that have a calming effect and induce sleep.
C. Hashish is a hallucinogen obtained from resin of Cannabis. It changes mood, behaviour, thoughts and causes hallucinations.
D. Opium is depressant of nervous system and has sedative, analgesic and narcotic effects.
Hence, statement C is correct.
So, the correct answer is 'Hashish causes after thought perceptions and hallucinations'.