Question

what is the main organ of the olfactory system?
glomerulus
olfactory bulb
mitral cell
olfactory epithelium

Explanation:

The olfactory epithelium contains the olfactory receptor neurons that detect odor molecules, serving as the primary sensory organ of the olfactory system. The glomerulus, mitral cell, and olfactory bulb are secondary structures that process signals after detection.

Answer:

Olfactory epithelium