This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S., Subject name: Medicine
A 35-year-old previously healthy woman complains of a severe, excruciating headache and then has a transient loss of consciousness. There are no focal neurologic findings. The next step in evaluation is: 
Select and explain. 
A. CT scan without contrast, B. CT scan with contrast, C. Carotid angiogram, D. Holter monitor
A: CT scan without contrast
Answer: A: CT scan without contrast 
Explanation: Ans. A. CT scan without contrasta. An excruciating headache with syncope requires evaluation for subarachnoid hemorrhage.b. Visualized on a non-contrast CT scan.