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
A 32 year old male patient complains of swelling in left maxillary region with heaviness in the maxillary sinus following tooth extraction of maxillary first molar. Patient gives a history of tooth extraction one week before with transalveolar type of extraction.

The most common microbial population found in a infected maxillary sinus are 
Select and explain. 
A. Poly Microbial with Anaerobic Organism, B. Aerobic Organisms, C. Fungal, D. Viral
A: Poly Microbial with Anaerobic Organism
Answer: A: Poly Microbial with Anaerobic Organism 
Explanation: None