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: Consider Input: Question: The excitotoxins activate: 
 Options:  <1> Nicotinic receptors <2> GABAA receptors <3> Glycine receptors. <4> NMDA receivers. <5> Na + channels dependent on voltage.

Output: 4


Input: Consider Input: Question: How many pairs of spinal nerves are connected to the spinal cord? 
 Options:  <1> Twenty eight. <2> Twenty nine. <3> Thirty one. <4> Thirty-three. <5> Thirty-five.

Output: 3


Input: Consider Input: Question: They can be part of the B lymphocyte receptor on the cell surface: 
 Options:  <1> IgM and IgG. <2> IgD and IgG. <3> IgD and IgM. <4> IgA and IgM. <5> IgG and IgE.


Output: 3