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
Respiratory depression is caused by A/E - 
Select and explain. 
A. Opium, B. Barbiturate, C. Strychnine, D. Gelsemine
C: Strychnine
Answer: C: Strychnine 
Explanation: Strychnine causes respiratory stimulation.
Other three options can cause respiratory depression