A Physician Wants to Deliver a Therapeutic Aerosol to the Upper

A physician wants to deliver a therapeutic aerosol to the upper airway (nose, larynx, trachea) . To help ensure maximum deposition in this area, you would select an aerosol generator with an MMAD in what range?

A) 5 to 50 $\mu$ m
B) 2 to 5 $\mu$ m
C) 1 to 3 $\mu$ m
D) less than 1 $\mu$ m