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
[{'content': 'All adverse effects of theophylline are mediated by A1, receptor except: \nSelect and explain. \nA. Cardiac arrhythmias, B. Dieresis, C. Seizures, D. GI discomfo', 'role': 'user'}, {'content': "Answer: D \nExplanation: Theophylline exes it's bronchodilation effect by PDE inhibition effect and Adenosine A1 antagonism. It has multiple side effect : Nausea and vomiting PDE inhibition Headache PDE inhibition Gastric discomfo PDE inhibition Diuresis Adenosine A1 antagonism Arrythmias PDE inhibition, A 1 antagonism Seizures Adenosine A1 antagonism", 'role': 'assistant'}]