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
A patient has seasonal allergic rhinitis and is on terfenadine. He develops cardiac arrhythmias after a course of antibiotics. Which of the following antibiotic could have been given: 
Select and explain. 
A. Ampicillin, B. Tetracycline, C. Erythromycin, D. Co-trimoxazole
C: Erythromycin
Answer: C: Erythromycin 
Explanation: None