The correct option is A hypothalamus
The cerebrum, thalamus and hypothalamus are parts of the forebrain. The outer layer of the cerebrum is called cerebral cortex. The cerebrum is divided into right and left hemispheres.
The inner parts of cerebral hemispheres and a group of associated deep structures like amygdala, hippocampus form a complex structure called the limbic lobe or limbic system.
Along with the hypothalamus, it is involved in the regulation of sexual behaviour, expression of emotional reactions (e.g., excitement, pleasure, rage and fear), and motivation.
Thalamus is a major coordinating centre for sensory and motor signaling.