This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Asthma, Subject name: Pharmacology
All of the following is antitussives EXCEPT - 
Select and explain. 
A. Codeine, B. Dextromethorphan, C. Noscapine, D. Ambroxol
D: Ambroxol
Answer: D: Ambroxol 
Explanation: (D) (Ambroxol) (218 - KDT 7th)Ambroxol is mucolytics.(A) ANTITUSSIVES (Cough centre suppressants)(a) Opioids: Codeine, Ethylmorphine, Pholcodeine.(b) Non opioids: Noscapine, Dextromethorphan, chlorphe dianol.(c) Antihistaminics - Chlorpheniramine, Diphenhydramine, Promethazine.(d) Peripheral acting: Prenoxdiazine(B) ADJUVANT AntitussivesBronchodilators - Salbutamol, Terbutaline.Expectorants (Mucolytics) - Bromhexine, Ambroxol, Acetylcysteine, Carbocisteine.