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: Medicine
A 35-year-old man presents with daily headache. He describes two attacks per day over the last 3 weeks. Each attack lasts about an hour and awakens him from sleep. The patient has noticed associated tearingand reddening of the right eye as well as nasal stuffness. The pain's deep, excruciating, and limiting to the right side of the head. The neurological examination is normal. What is the most likely diagnosis ? 
Select and explain. 
A. Migraine headache, B. Tension headache, C. Cluster headache, D. Brain tumour
C: Cluster headache
Answer: C: Cluster headache 
Explanation: None