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
Antitussive opioid is ? 
Select and explain. 
A. Ethylmorphin, B. Pethidine, C. Methadone, D. Buprenorphine
A: Ethylmorphin
Answer: A: Ethylmorphin 
Explanation: Ans. is 'a' i.e., Ethylmorphine Antitussives (cough center suppressants) Opioids : Codeine, ethylmorphine, pholcodeine. Non-opioids : Noscapine, dextro methorphan, chlophedianol. Antihistaminics : Chlorpheniramine, diphenhydromine, promethazine. Peripherally active : Prenoxdiazine.