<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 23-year-old man comes to the emergency department for 2 days of severe headaches. The pain is most intense on his left forehead and eye. He had similar symptoms last summer. He has been taking indomethacin every 6 hours for the last 24 hours but has not had any relief. He has smoked 1 pack of cigarettes daily for the past 5 years. He works as an accountant and describes his work as very stressful. Physical examination shows drooping of the left eyelid, tearing of the left eye, and rhinorrhea. The left pupil is 2 mm and the right pupil is 4 mm. There is localized tenderness along the right supraspinatus muscle. The remainder of the examination shows no abnormalities. Which of the following is the most likely diagnosis?? A: Giant cell arteritis, B: Medication overuse headache, C: Cluster headache, D: Trigeminal neuralgia, E: Tension headache,  <response>: This is a clinical case scenario describing a 23-year-old man with severe headaches localized to the left forehead and eye. He has a history of similar headaches last summer, suggesting a recurrent pattern. Key findings on exam include left eyelid drooping, left eye tearing, left pupil miosis, and right supraspinatus tenderness. The recurrent nature of the unilateral headaches localized to the left eyeforehead region suggests this is likely a trigeminal autonomic cephalalgia. The differential diagnosis includes cluster headache, paroxysmal hemicrania, and short-lasting unilateral neuralgiform headache attacks. The duration of 2 days is most consistent with cluster headache. Tension headache is unlikely given the unilateral nature. Medication overuse headache may occur but would not explain the other neurologic findings. Giant cell arteritis is very unlikely in a 23-year-old. Trigeminal neuralgia also presents with unilateral facial pain but lacks autonomic symptoms.C: Cluster headache 