<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 33-year-old man comes to the emergency department because of repeated episodes of severe headache for the past 3 days. He is currently having his 2nd episode of the day. He usually has his first episode in the mornings. The pain is severe and localized to his right forehead and right eye. He had similar symptoms last summer. He works as an analyst for a large hedge fund management company and spends the majority of his time at the computer. He has been under a lot of stress because of overdue paperwork. He also has chronic shoulder pain. He has been using indomethacin every 6 hours for the pain but has had no relief. He has smoked one pack of cigarettes daily for 15 years. He appears restless. Vital signs are within normal limits. Physical examination shows drooping of the right eyelid, tearing of the right eye, and rhinorrhea. The right pupil is 2 mm and the left pupil is 4 mm. There is localized tenderness to his right supraspinatus muscle. The remainder of the examination shows no abnormalities. Which of the following is the most likely diagnosis?? A: Migraine headache, B: Cluster headache, C: Giant cell arteritis, D: Subarachnoid hemorrhage, E: Medication overuse headache,  <response>: This is likely a question about diagnosing cluster headaches based on the clinical presentation. The key features pointing to cluster headaches are:- Repeated episodes of severe unilateral headache localized to the right forehead and eye- Occurring daily at around the same time, especially in the mornings - History of similar headache episodes last summer cluster headaches tend to be episodic- Restlessness during the headache- Unilateral pupillary miosis constricted pupil on the same side as the headacheOther diagnoses are less likely:- Migraine headaches are not as strictly unilateral or circadian. - Giant cell arteritis would cause other symptoms like jaw claudication. - Subarachnoid hemorrhage is a possibility but not classic without neurological deficits.- Medication overuse headache may play a role but not the primary diagnosis.B: Cluster headache 