In which of the following is the cerebral cortex absent?

Read the following statements carefully and select the correct option:
$I.$ The medulla is connected to the spinal cord.
$II.$ Medulla contains controlling centres for respiration,cardiovascular reflexes and gastric secretion.
$III.$ Cerebellum has a very convoluted surface in order to provide the additional space for more neurons.

The brain acts as the $A$ and $B$ system.
Here,$A$ and $B$ refer to:

The $3^{rd}$,$6^{th}$ and $11^{th}$ cranial nerves are:

The olfactory lobes of a rabbit are:

Alcohol consumption primarily affects the .....