question: Q:A 15-year-old boy is brought to the emergency department one hour after sustaining an injury during football practice. He collided head-on into another player while wearing a mouthguard and helmet. Immediately after the collision he was confused but able to use appropriate words. He opened his eyes spontaneously and followed commands. There was no loss of consciousness. He also had a headache with dizziness and nausea. He is no longer confused upon arrival. He feels well. Vital signs are within normal limits. He is fully alert and oriented. His speech is organized and he is able to perform tasks demonstrating full attention, memory, and balance. Neurological examination shows no abnormalities. There is mild tenderness to palpation over the crown of his head but no signs of skin break or fracture. Which of the following is the most appropriate next step?? 
  {'A': 'Discharge without activity restrictions', 'B': 'Administer prophylactic levetiracetam and observe for 24 hours', 'C': 'Administer prophylactic phenytoin and observe for 24 hours', 'D': 'Discharge and refrain from all physical activity for one week', 'E': 'Observe for 6 hours in the ED and refrain from contact sports for one week'},