Step 1: Understanding the Concept
Cannabinoids are chemicals obtained from the inflorescence, leaves and resin of Cannabis sativa. They act on cannabinoid receptors in the brain.
Step 2: Cannabis products
Marijuana, hashish, charas and ganja are all products of this plant.
Step 3: Compare the options
Heroin and morphine are opioids. Cocaine comes from the coca plant. LSD is a hallucinogen.
Step 4: Conclusion
The group of cannabinoids is marijuana, hashish and charas.
Final Answer:
Marijuana, hashish and charas are cannabinoids.
\[ \boxed{\text{(C) }\text{Marijuana, Hashish, Charas}} \]