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: Which of the following diatomic molecules has the lowest binding energy ?: 
 Options:  <1> N2 <2> H2. <3> I2. <4> O2. <5> Cl2.
