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
Alarm clock headache is: 
Select and explain. 
A. Sphenopalatine neuralgia., B. Auriculotemporal neuralgia., C. Glossopharyngeal neuralgia., D. Occipital neuralgia.
A: Sphenopalatine neuralgia.
Answer: A: Sphenopalatine neuralgia. 
Explanation: None