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: Of the following pollutants, which has a greater affinity for hemoglobin producing alterations in brain, myocardial and muscular tissue? 
 Options:  <1> Carbon monoxide. <2> Carbon dioxide. <3> Nitric monoxide <4> Sulfur dioxide. <5> Ozone.
