Which part of the brain is primarily involved in processing smell signals from the olfactory nerve?

The olfactory bulb is the correct answer because it is directly involved in processing smell signals that are transmitted from the olfactory nerve. When odor molecules bind to receptors in the nasal cavity, signals are sent via the olfactory nerve to the olfactory bulb, which acts as the main processing center for olfactory information in the brain. From the olfactory bulb, this information is relayed to other parts of the brain, including the limbic system and the frontal lobe, playing a crucial role in the perception of smells and their emotional significance. This direct connection makes the olfactory bulb essential for the sense of smell, distinguishing it from other brain areas that may be involved in sensory processing but are not specifically dedicated to olfaction.