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: Among the 5 types of histones of chromatin, the one with the lowest molecular weight is: 
 Options:  <1> H2A. <2> H2B. <3> H1 <4> H4 <5> H3
