Task: Question Answering
Input (English): 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 120º (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 120º (equilateral triangle) and a pair of free electrons. <5> Angular, with the S atom in the center and with an angle close to 109º (tetrahedron) and two pairs of free electrons.
Output (English): 3