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: To calculate the number of different genotypes in any allelic series the formula is applied: 
 Options:  <1> (n-1) / 2. <2> n x (n + 1) / 2. <3> n x (n-1) / 2. <4> (n-1) x (n + 1) / 2. <5> (2n-1) / 2.
Example Output: 2

Example Input: Question: An isolated carbon atom is: 
 Options:  <1> Diamagnetic <2> Ferromagnetic. <3> Paramagnetic, with an unpaired electron. <4> Paramagnetic, with two unpaired electrons. <5> Paramagnetic, with three unpaired electrons.
Example Output: 4

Example Input: Question: The proofreading activity of DNA Polymerase: 
 Options:  <1> It is a 5'-3'exonuclease activity. <2> It is a 3'-5'exonuclease activity. <3> It is a 5'-3'polymerizing activity. <4> It is an endonuclease activity. <5> It is a transesterification activity.
Example Output:
2

