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: Pediatrics
Which of the following is an indiction for tonsillectomy –a) Rheumatic feverb) Glomerulonephritisc) Recurrent upper respiratory infectiond) Persistent carrier of diptheria bacilli 
Select and explain. 
A. ab, B. cd, C. bd, D. ac
B: cd
Answer: B: cd 
Explanation: Indications of tonsillectomy 

Recurrent sore throat —› If more than six attacks of tonsillitis in a year for two consecutive years.
Tonsillar or peritonsillar abscess              o Retention cyst of tonsil                  o Diphtheria carriers
Tonsillolith                                                   o Suspicious malignancy                  o Obustructive sleep apnea