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
Complications of acute sinusitis -a) Orbital cellulitisb) Pott's puffy tumour c) Conjunctival chemosis d) Subdural abscess 
Select and explain. 
A. abc, B. bcd, C. abd, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Complications of Sinusitis—Acute Sinusitis