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: Catalase: 
 Options:  <1> Acts on hydrogen peroxide. <2> It results in the formation of hydrogen peroxide. <3> It acts on the superoxide anion. <4> It converts hydrogen peroxide into superoxide anion. <5> Use glutathione as a cofactor.
Example Output: 1

Example 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.
Example Output: 4

Example Input: Question: The maturation process for the dendritic cell involves important changes in its physiology, such as: 
 Options:  <1> Decreased expression of the CCR7 marker. <2> Reduction of endocytic capacity. <3> Decreased expression of histocompatibility molecules. <4> Synthesis of IL-13. <5> Reduction of CD40 expression.
Example Output:
2