This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Forensic Medicine
Speed ball is - 
Select and explain. 
A. Opioid + cocaine, B. Opioid + antihistaminic, C. Cocaine + alcohol, D. Cocaine + marijuana
A: Opioid + cocaine
Answer: A: Opioid + cocaine 
Explanation: Ans. is 'a' i.e., Opioid + cocaine o A combination of cocaine and heroin (opioid)taken by injection is called speed ball.