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: Aflatoxin B1 is a natural product that owes its toxicity to a product of its metabolism, very reactive, of the nature of: 
 Options:  <1> 1,2-Diol. <2> Quinonymine <3> Epoxide <4> Α, β-unsaturated carbonyl. <5> Radical hydroperoxide.
