Which of the following structures is characteristically present only in the mammalian brain?

Functions of association areas in the cerebral cortex include:

Given below are two statements $:$
Statement-$I$ : The cerebellar hemispheres are connected by a tract of nerve fibres known as the corpus callosum.
Statement-$II$ : The brain stem consists of the midbrain and all parts of the hindbrain.
In the light of the above statements,choose the most appropriate answer from the options given below.

Memory is the responsibility of

Statement $I :-$ The cerebral medulla is referred to as the grey matter due to its greyish appearance.
Statement $II :-$ The neuron cell bodies are concentrated in cerebral medulla giving the colour.

Association areas are responsible for complex functions like: