Q. A 53-year-old man is brought to the ER because of a sudden onset severe headache (thunderclap headache) with nausea and vomiting that started 30 minutes ago. He was running in the park when he suddenly developed his symptoms. The headache radiates to his neck. He has hypertension which is treated with losartan. He had smoked 1 pack of cigarettes daily for the past 35 years. His temperature is 37.6 °C , HR is 90 beats/ minutes, BP is 145/90,and RR is 19 breaths/minutes. On exam, he is lethargic. The Kernig sign is positive. A CT scan of his head is ordered and the result is shown below. Which of the following is the correct diagnosis?