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': 'Which of the following expectorant causes gastric irritation & reflex increase in bronchial gland secretions \nSelect and explain. \nA. Ambroxol, B. Guaifenesin, C. Sodium cromoglycate, D. Fosaprepitant', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Guaifenesin, hypertonic saline & ammonium cloride are the expectorants that cause gastric irritation and also reflexly increase bronchial gland secretions.', 'role': 'assistant'}]