A 68-year-old male patient presents with acute onset of left-sided weakness and slurred speech. Which of the following is the most appropriate initial diagnostic test? A) Complete blood count B) Chest X-ray C) Computed tomography (CT) scan of the head D) Electrocardiogram (ECG) Correct Answer: C) Computed tomography (CT) scan of the head Rationale: A CT scan of the head is the most appropriate initial test to rule out a stroke, which is consistent with the patient's symptoms. A patient with chronic back pain is scheduled for a lumbar puncture. Which of the following is a contraindication for this procedure? A) Use of anticoagulant medication B) Allergy to contrast dye C) Previous lumbar surgery D) Presence of i