Its op A mammals. the corpus collasum, corpora quadrigemina and optic chiasma present in brain are exclusively present only in mammals.

Introduction:
The corpora quadrigemina, also known as the optic lobes or colliculus, are a set of small, solid structures found in the brain. They are responsible for processing visual and auditory information. In this question, we need to determine in which group of animals these structures are found.

Explanation:
The corpora quadrigemina are found in mammals. Let's discuss the options given in the question and why they are incorrect:

a) Mammals (Correct Option): Mammals possess corpora quadrigemina. These structures are located in the midbrain and are responsible for processing visual and auditory information. They play a crucial role in coordinating eye and head movements in response to visual stimuli.

b) Amphibians (Incorrect Option): While amphibians do have optic lobes, they do not possess corpora quadrigemina. Instead, they have optic tecta, which are responsible for processing visual information.

c) Aves (Incorrect Option): Birds, or aves, possess optic lobes but lack corpora quadrigemina. They have optic tecta, similar to amphibians, which are responsible for processing visual information.

d) Reptiles (Incorrect Option): Reptiles also have optic lobes, but they lack corpora quadrigemina. Similar to amphibians and birds, they have optic tecta for processing visual information.

Summary:
In conclusion, the small, solid structures known as corpora quadrigemina or optic lobes are found in mammals. They are responsible for processing visual and auditory information and play a crucial role in coordinating eye and head movements. These structures are not present in amphibians, birds, or reptiles.