## Core Concept
The nasolacrimal duct is a passage for tears to drain from the eye into the nasal cavity. It plays a crucial role in the lacrimal apparatus, which is responsible for tear production and drainage. The duct's direction is essential for understanding its function and anatomical relations.

## Why the Correct Answer is Right
The nasolacrimal duct is directed downwards and laterally. It extends from the lacrimal sac to the inferior meatus of the nasal cavity. This downward and lateral direction allows for the efficient drainage of tears from the eye into the nasal cavity.

## Why Each Wrong Option is Incorrect
* **Option A:** If the direction were only downwards, it would not accurately describe the duct's course, as it also has a lateral component.
* **Option B:** A direction that is only lateral would not be correct, as the duct also extends downwards.
* **Option C:** This option is not provided, but based on the correct answer, any option that does not describe a downward and lateral direction would be incorrect.

## Clinical Pearl / High-Yield Fact
A key clinical correlation to remember is that blockage of the nasolacrimal duct can lead to epiphora (excessive tearing) and dacryocystitis (infection of the lacrimal sac). The duct's direction and anatomy are critical for understanding these conditions.

## Correct Answer: D. Downwards and laterally.