The limbic system, which includes structures such as the amygdala and hippocampus, plays a significant role in regulating emotions, including fear, pleasure, and anger. The hypothalamus, another component of the limbic system, is involved in various functions, including the regulation of sexual behavior and responses to pleasure and excitement. Therefore, option D is correct.

Option (A), (B) and (C) are not correct because corpora quadrigemina is a part of the midbrain and consists of four round swellings. Corpus callosum is a tract of nerve fibres that connects right and left cerebral hemispheres. Thalamus is a major coordinating centre in the forebrain for sensory and motor signalling. Midbrain, pons and medulla oblongata together form the brain stem.