【正确答案】 A

【答案解析】Headache following a lumbar puncture is usually caused by cerebrospinal fluid (CSF) leakage. Increased fluid intake will help restore CSF volume. Antihypertensives don't address the problem. Roll lenses reduce light irritation to the eyes and ice may reduce site pain, but neither intervention addresses the problem of reduced CSF volume, which causes the headache.