**Core Concept**
The Moro reflex is a **physiological reflex** present in newborns, characterized by a specific sequence of movements in response to a sudden loss of support. It involves the **brainstem** and **spinal cord**. This reflex is an important indicator of **neonatal neurological status**.

**Why the Correct Answer is Right**
A brisk Moro reflex is typically seen in healthy infants, indicating intact **central nervous system** function. The reflex involves the sequential movement of the arms, followed by their return to the midline, and is usually elicited by suddenly removing support from the infant's head or body, simulating a fall. The presence of a brisk Moro reflex suggests that the **nervous system pathways** responsible for this reflex are intact.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the Moro reflex is not typically associated with this condition.
**Option B:** Similarly, this option does not accurately describe the condition where a brisk Moro reflex is seen.
**Option D:** This option is also incorrect as it does not relate to the Moro reflex.

**Clinical Pearl / High-Yield Fact**
The Moro reflex is an important **neonatal reflex** that disappears by 3-6 months of age. Its absence or persistence beyond this age can indicate **neurological abnormalities**.

**Correct Answer:** D. Normal newborn