Teacher: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'.
Teacher: Now, understand the problem? Solve this instance: Question: In toxicology, the probability of adverse effects, harmful to health, from exposure to a toxic agent is known as: 
 Options:  <1> Danger. <2> Exposition. <3> Risk. <4> Answer. <5> Effect.
Student:
3