What Amount of Ipratropium Bromide (Atrovent) Is Delivered by Metered-Dose $\mu$

Multiple Choice

What amount of ipratropium bromide (Atrovent) is delivered by metered-dose inhaler?

A) 10 $\mu$ g/puff
B) 15 $\mu$ g/puff
C) 18 $\mu$ g/puff
D) 90 $\mu$ g/puff