This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
A 55 year old drug addict from California presents with euphoria, altered time perception, and conjuctival injection. There is impairment of judgment. Most likely cause is addiction from substance 
Select and explain. 
A. Marijuana, B. Cocaine, C. Phencyclidine, D. Benzodiazepine
A: Marijuana
Answer: A: Marijuana 
Explanation: Marijuana