Topic: Subarachnoid Hemorrhage
Subject: Medicine
A 36-year-old female presents with the sudden onset of severe headache, nausea, and photophobia. Her level of consciousness is progressively diminishing. Which one of the following would be the most appropriate next step?

A. Head CT without contrast

B. Head CT with contrast

C. Head MRI

D. Lumbar puncture

Please do not use chat terms. Example: avoid using "grt" instead of "great".