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: Which of the following medications is an anti CD20 monoclonal antibody used in the treatment of rheumatoid arthritis? 
 Options:  <1> Alemtuzumab <2> Muromunab. <3> Abalizumab <4> Rituximab <5> Visilizumab.

Ex Output:
4


Ex Input:
Question: The standard free energy of activation of a reaction is: 
 Options:  <1> The difference in free energy between the basal state of the products and the substrates. <2> The difference of the enthalpy minus the entropy of the system. <3> The basal energy of the substrates in a catalyzed reaction. <4> The additional free energy that molecules must reach to reach the state of transition. <5> The energy released from a catalysed reaction.

Ex Output:
4


Ex Input:
Question: In eukaryotes, the DNA polymerase β: 
 Options:  <1> It is a polymerase of family B. <2> It carries out the synthesis and repair of mitochondrial DNA. <3> Replicate DNA with injuries. <4> It is involved in the repair of nuclear DNA. <5> The synthesis of nuclear DNA begins.

Ex Output:

4