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: The SO2 molecule is:
Options: <1> Linear, with the S atom in the center. <2> Linear, with one of the atoms of O in the center. <3> Angular, with the S atom in the center and with an angle close to 120 (equilateral triangle) and a free pair of electrons. <4> Angular, with one of the atoms of O in the center and with an angle of approximately 120 (equilateral triangle) and a pair of free electrons. <5> Angular, with the S atom in the center and with an angle close to 109 (tetrahedron) and two pairs of free electrons.
Student:
3