The correct answer is option 'D' - Corpora quadrigemina.

The brain is a complex organ that controls our body's functions and processes information. It is divided into several regions, each with its own specific functions. One of these regions is the corpora quadrigemina, which is located in the midbrain.

The corpora quadrigemina, also known as the tectum, is composed of four rounded elevations, two superior and two inferior colliculi. It plays a critical role in processing visual and auditory information.

The corpora quadrigemina can be further divided into two parts:

1. Superior colliculi:
- The superior colliculi are responsible for processing visual information.
- They receive input from the eyes and are involved in visual reflexes, such as eye movements in response to a moving object.
- The superior colliculi also play a role in directing attention towards visual stimuli.

2. Inferior colliculi:
- The inferior colliculi are responsible for processing auditory information.
- They receive input from the ears and are involved in auditory reflexes, such as the startle response to a loud noise.
- The inferior colliculi also play a role in localizing sound sources and integrating auditory information.

Overall, the corpora quadrigemina is an important part of the brain involved in processing visual and auditory information and coordinating appropriate responses. It is essential for our ability to see, hear, and respond to sensory stimuli in our environment.

To summarize:

- The corpora quadrigemina is a part of the brain located in the midbrain.
- It is composed of four rounded elevations called the superior and inferior colliculi.
- The superior colliculi process visual information and are involved in visual reflexes and attention.
- The inferior colliculi process auditory information and are involved in auditory reflexes and sound localization.