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: ENT
Sinusitis most common complication- 
Select and explain. 
A. Orbital cellulitis, B. Meningitis, C. Brain abscess, D. Septicemia
A: Orbital cellulitis
Answer: A: Orbital cellulitis 
Explanation: None