This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral Cavity, Subject name: ENT
Penicillin should be given to a patient with group A beta haemolytic streptococci infection of the tonsils for a period of: 
Select and explain. 
A. 3-5 days, B. 10-14 days, C. 21 days, D. 1 month
B: 10-14 days
Answer: B: 10-14 days 
Explanation: Ans: b