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'.

Example Input: Question: The control of vital signs is fundamental in the assessment of the neurological patient. Many neurological disorders can present alterations of the respiratory pattern or frequency, indicating damage to the respiratory center or the nervous system. One of these abnormal breathing patterns, present in meningitis or cases of supratentorial injury, is Cheyne-Stokes respiration, characterized by: 
 Options:  <1> Regular frequency and superficial character. <2> Absence of clearly observable breathing. <3> A series of breaths that increase in amplitude / intensity to a maximum point in which they begin to decrease, followed by an apnea pause. <4> Slow and regular breaths with a frequency less than 10 per minute. <5> It is an abnormal and sustained increase in both depth and respiratory rate.
Example Output: 3

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

Example Input: Question: The reovirus .: 
 Options:  <1> They are released from the cell by budding. <2> They replicate their genetic material in the cell nucleus. <3> They have a lipid envelope. <4> They form virions resistant to acid pH. <5> They are transmitted by blood.
Example Output:
4