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: Radiology
Most common complication of myelography is 
Select and explain. 
A. Allergic reaction, B. Headache, C. Focal neurological deficit, D. A rachanoi di tis
B: Headache
Answer: B: Headache 
Explanation: B i.e. Headache