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
[{'content': 'Bromhexine acts by \nSelect and explain. \nA. Central opiod agonism, B. Muscarine receptor antagonism, C. Depolymerisation of mucopolysaccharides, D. MAO inhibitor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bromhexine acts by depolymerisation of mucopolysaccarides and making the mucus less viscid and thus acts as a expectorant.', 'role': 'assistant'}]