Answer:
Olfactory bulb.
Explanation:
The olfactory system is the sensory system responsible for the sense of smell. When you sniff something, you are actually sucking tiny particles called aromatic substances into your nose. The nasal cavity is the area filled with air behind your nose. Aromatic substances pass through the nasal cavity to the olfactory bulb, which contains sensory receptors that receive the aromatic substances. The receptors in the olfactory bulb send signals to the brain