This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which are the cells of olfactory bulb that act as local integrator? 
Select and explain. 
A. Sustentacular cells, B. Hair cells, C. Granular cells, D. Mitral cells
D: Mitral cells
Answer: D: Mitral cells 
Explanation: Ans. is 'd' i.e., Mitral cellsIn olfactory bulb axons of olfactory nerve synapse with dendrites of mitral cells to form the olfactory glomeruli.Mitral cells are the principal output neurons of olfactory bulb anil their axons form the olfactory tract