You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "what is the liquid in the brain called?" whose answer is Cerebrospinal fluid.
Each document should contain about 30 words, and these documents should contain useful information.

Query: what liquid is in the brain
Useful Output:

Doc 1: What is Hydrocephalus and Why Does Fluid Build Up in the Brain? · Comments106. Kenny Jones. I am a 45 year old male. I received my first shunt
Doc 2: Cerebrospinal fluid, or CSF, which not only cushions the brain and spinal cord from injury but also delivers nutrients and removes waste from the brain.
Doc 3: Hydrocephalus is an excessive accumulation of cerebrospinal fluid on the brain, causing abnormal dilation of brain spaces known as ventricles.
Doc 4: Cerebrospinal fluid usually flows through the ventricles and bathes the brain and spinal column.
Doc 5: How much do you know about your brain? Take the brain quiz to test your knowledge and learn more about your amazing brain!