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: ENT
Not a contraindication of routine Tonsillectomy - 
Select and explain. 
A. Upper respiratory tract infections, B. Bleeding disorder, C. Diphtheria carriers, D. Cleft palate
C: Diphtheria carriers
Answer: C: Diphtheria carriers 
Explanation: None