Please Read the Clinical Scenario, and Then Answer the Question

Multiple Choice

Please read the clinical scenario, and then answer the question that follow to become familiar with the traditional NCLEX question format.
Amanda is a 20-year-old college student who lives on campus. Her roommate brought her into your emergency room, because Amanda is not acting like herself. She was previously healthy, very involved in campus politics, and a 4.0 student. About 2 weeks ago, she started not feeling well. She had bad nasal congestion, and was diagnosed with a sinus infection. However, she decided against taking antibiotics because she did not believe they were good for her. She started getting very high fevers, which Amanda told her roommate were good because they were killing the infection. Yesterday, she started complaining of a stiff neck, and today she seems especially lethargic with a fever of 105. Her roommate was scared, so she forced her into her car and has driven her to your ICU.
-Which of the following tests will be most helpful in confirming Amanda's diagnosis?

A) CT scan
B) chest X ray
C) complete blood count
D) lumbar puncture