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: Counter Coulter® particle counter uses an electrolytic solution of: 
 Options:  <1> 0.9% lithium chloride in water. <2> Ammonium thiocyanate in hydrophilic solvent. <3> 15% lithium chloride in hydrophobic solvent. <4> 0.9% sodium chloride in water. <5> 0.9% sodium chloride in methanol.
