**Core Concept**
Pneumococcal meningitis is a type of bacterial meningitis caused by Streptococcus pneumoniae, leading to inflammation of the meninges, which are the protective membranes surrounding the brain and spinal cord. The cerebrospinal fluid (CSF) analysis is crucial for diagnosing and managing this condition.

**Why the Correct Answer is Right**
In pneumococcal meningitis, the CSF typically shows elevated levels of white blood cells, particularly polymorphonuclear leukocytes, indicating a bacterial infection. Additionally, the CSF glucose levels are decreased, and the protein levels are increased, reflecting the breakdown of the blood-brain barrier and the inflammatory response. The CSF lactate levels are also elevated, which is a marker of bacterial metabolism.

**Why Each Wrong Option is Incorrect**
**Option A:** This option may be tempting, but pneumococcal meningitis is not typically associated with a normal CSF glucose level. Elevated glucose levels are more characteristic of viral meningitis.
**Option B:** While protein levels are indeed elevated in pneumococcal meningitis, this option is too vague and does not capture the full spectrum of CSF abnormalities seen in this condition.
**Option C:** This option is incorrect because pneumococcal meningitis is not typically associated with a high CSF pressure. In fact, increased intracranial pressure is more common in this condition due to the inflammation and edema.

**Clinical Pearl / High-Yield Fact**
In pneumococcal meningitis, the CSF glucose-to-blood glucose ratio is often less than 0.4, which is a useful diagnostic clue. This is because the bacteria consume glucose, leading to a decrease in the CSF glucose levels.

**Correct Answer:** C. Elevated protein, decreased glucose, and elevated lactate levels in the CSF.