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: Pathology
Sphenopalatine neuralgia is also known as: 
Select and explain. 
A. Lower half headache., B. Sluder's headache., C. Horton's syndrome., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: None