Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Indicate the correct units of a zero order rate constant: 
 Options:  <1> mg-1. <2> h-1. <3> mg / h. <4> g X h / mL. <5> mL / h.
