All spinal nerves are

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.

If a person has lost his memory in an accident,which part of the brain has been injured?

Which of the following structures contains $H$-shaped grey matter?

What does the $Corpus$ $callosum$ connect?

Match the spinal nerves in Column $1$ with their respective pairs in Column $2$ and select the correct option.

Column $1$	Column $2$
$(a)$ Cervical nerves	$(i)$ $5$ pairs
$(b)$ Thoracic nerves	$(ii)$ $1$ pair
$(c)$ Sacral nerves	$(iii)$ $12$ pairs
$(d)$ Coccygeal nerves	$(iv)$ $8$ pairs