This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pharmacology
The following antitussive is present in opium but has no analgesic or addicting propeies 
Select and explain. 
A. Codeine, B. Pholcodeine, C. Noscapine, D. Ethylmorphine
C: Noscapine
Answer: C: Noscapine 
Explanation: Noscapine (Narcotine):- An opium alkaloid of the benzoisoquinoline series. Mech of action:- It depresses cough but has no narcotic, analgesic or dependence inducing propeies. It is nearly equipotent antitussive as codeine, especially useful in spasmodic cough. side effects:- Headache and nausea avoided r contraindication:- It release histamine and produce bronchoconstriction in asthmatics. Ref:- kd tripathi; pg num:- 220