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'.

Ex 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.

Ex Output:
2


Ex Input:
Question: In the path that leads in the liver to acetoacetate biosynthesis from acetyl CoA, which of the following substances is the immediate precursor of acetoacetate? 
 Options:  <1> 3-Hydroxybutyrate <2> Acetoacetyl CoA. <3> 3-Hydroxybutyrate CoA. <4> Mevalonic acid. <5> 3-Hydroxy-3-methylglutaryl. CoA.

Ex Output:
5


Ex Input:
Question: Which of the following parenteral vaccines is contraindicated during pregnancy? 
 Options:  <1> Vaccine against tetanus. <2> Vaccine against measles. <3> Vaccine against whooping cough. <4> Vaccine against hepatitis B. <5> Vaccine against the flu.

Ex Output:

2