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 square of Pearson's correlation coefficient is:
Options: <1> The coefficient of variation. <2> The coefficient of determination. <3> The slope of the regression line. <4> The regression coefficient. <5> The covariance.
Example Output: 2

Example Input: Question: The pyramidal neurons are in:
Options: <1> Cerebellum. <2> Brain. <3> Spinal cord. <4> Spinal ganglia. <5> Hypophysis.
Example Output: 2

Example Input: Question: Faced with a 23-year-old patient who went to the emergency room on a Friday morning after a street fight, with clear signs of enolism and knife injury (stabbing) at the level of III right intercostal space 3 mm from the sternal margin, actively bleeding and hemodynamically unstable associated with marked hypophonia of all right hemithorax. Which structure of the following should you think may be injured?
Options: <1> Right primitive carotid artery. <2> Right internal thoracic artery. <3> Right subscapular artery. <4> Upper right thyroid artery. <5> Thigh superior thymic artery.
Example Output:
2