This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
Peritonsillar abscess is most commonly caused by 
Select and explain. 
A. Streptococcus pneumonia, B. Staphylococcus aureus, C. Beta hemolytic streptococcus, D. Hemophilus influenza
C: Beta hemolytic streptococcus
Answer: C: Beta hemolytic streptococcus 
Explanation: Peritonsillar abscess ( Quinsy) is the collection of pus in the peritonsillar space which lies between the capsule of tonsil and superior constrictor muscle. A peritonsillar abscess usually follows acute tonsillitis. First crystal Magna is infected and sealed off. Culture of pus from the abscess May reveal beta-hemolytic streptococci, S.aureus, or anaerobic organisms. (Ref: Diseases of ENT, PL Dhingra, 7th edition, pg no.298)