This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastro-Intestinal Tract, Subject name: Pharmacology
[{'content': 'Which of the following drugs when combined erythromycin may cause ventricular arrhythmias? \nSelect and explain. \nA. Tetracycline, B. Streptomycin, C. Ebastine, D. Cisapride', 'role': 'user'}, {'content': 'Answer: D \nExplanation: - Erythromycin causes inhibition of CYP3A4 enzyme. - As a result of this, level of Cisapride rises in blood - High blood levels of Cisapride causes QT prolongation and leads to Torsades-de-pointes (ventricular arrythmia) so, the combination is avoided.', 'role': 'assistant'}]