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: Surgery
After incision and drainage of an abscess the infectious process has failed to regress inspite of the patient being on high doses of an antibiotic. It would be wise to: 
Select and explain. 
A. Insert a large drain, B. Repeat culture and sensitivity tests, C. Debride and irrigate the area with a fibrinolytic agent, D. Begin the parenteral administration of proteolytic enzymes to augment the antibiotics
B: Repeat culture and sensitivity tests
Answer: B: Repeat culture and sensitivity tests 
Explanation: None