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': 'Patient is on Cisapride for gastroesophageal reflux develops upper respiratory tract infection, and physician prescribes erythromycin. What pharmalogical interaction would be expected - \nSelect and explain. \nA. Dereased level of erythromycin and exacerbation of UI, B. Decreased effect of cisapride due to enzyme inductor of erythromycin, C. Fatal ventricular arrhythmia, D. Hemorrhagic cystitis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Fatal ventricular arrythmia", 'role': 'assistant'}]