This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Raised ICP and Brain death, Subject name: Medicine
A 40-year-old patient is brought with a head injury. Which of the following will help in decreasing the value of raised ICP? 
Select and explain. 
A. Administer Nimodipine, B. Hyperventilation, C. Prevent the fall of CO2 levels in the blood, D. Administer adequate analgesia
B: Hyperventilation
Answer: B: Hyperventilation 
Explanation: In patients with raised ICP: 20-25 mm Hg for > 5 minutes, the following steps are used for management: 1. Elevate head end 2. Drain CSF Ventriculostomy 3. Osmotherapy using mannitol 4. Glucocoicoids for vasogenic edema ( don't give in head injury and stroke) 5. Hyperventilation to maintain PaCO2at 30-35 mm Hg. (use for sho-term or skip the step due to limited efficacy) 6. vasopressor therapy with phenylephrine, dopamine, and norepinephrine to ensure CPP of >60 mm Hg. 7. Second tier therapy: Decompressive craniectomy Pentobarbital coma Therapeutic Hypothermia to 33 degrees