**Core Concept**
Meningomyelocele is a form of spina bifida where the meninges and spinal cord protrude through a defect in the vertebral column. Hydrocephalus in this context is likely due to impaired cerebrospinal fluid (CSF) circulation, which can lead to increased intracranial pressure.

**Why the Correct Answer is Right**
The development of hydrocephalus in a meningomyelocele patient is often due to a blockage of the CSF pathways. This can occur due to the presence of a tissue plug or adhesions within the neural tube, which prevents the normal flow of CSF. As a result, CSF accumulates in the ventricles, leading to increased intracranial pressure and hydrocephalus. The Arnold-Chiari malformation, a common association with meningomyelocele, can also contribute to this issue by compressing the fourth ventricle and impeding CSF circulation.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided, so we'll skip it.
* **Option B:** While infection and inflammation can cause hydrocephalus, they are not the primary reasons for hydrocephalus in meningomyelocele patients.
* **Option C:** This option is not provided, so we'll skip it.

**Clinical Pearl / High-Yield Fact**
In patients with meningomyelocele, hydrocephalus is a common complication and should be closely monitored post-operatively. A computed tomography (CT) scan or magnetic resonance imaging (MRI) of the brain is essential to confirm the diagnosis and plan appropriate management.

**Correct Answer:** D.