The watery, lymph-like fluid that surrounds the brain inside the skull, acts as a shock absorber and fills the central canal of the spinal cord is known as what?

1. The fluid cushions the brain and fills the spinal cord's central canal. 2. Pericardial fluid lubricates the heart, not the brain, ruling out option A. 3. Plasma and lymph circulate in the blood and lymphatic systems, ruling out options C and D. 4. The brain's shock-absorbing fluid is cerebrospinal fluid, option B. _Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 15 Nervous System "Hypothalamus", p.229_