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: What speed of perfusion of a drug should you administer to achieve a plasma equilibrium concentration of 10 mg / L knowing that it has a plasma clearance of 500 mL / h? (continuous perfusion): 
 Options:  <1> 50 mg / h. <2> 5 mL / h. <3> 100 mg / h. <4> 100 mg / mL. <5> 5 mg / h.
