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: Forensic Medicine
Which of the follow is a "somniferous toxin" ? 
Select and explain. 
A. Dhatura, B. Opium, C. Belladonna, D. Cannabis
B: Opium
Answer: B: Opium 
Explanation: None