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: In an electrogravimetric analysis: 
 Options:  <1> The increase in mass of the electrode indicates the amount of analyte. <2> Current performance must be 100%. <3> A platinum mesh is always used as a working electrode. <4> A reference electrode is always needed. <5> The solution does not need to be conductive.
Example Output: 1

Example Input: Question: What percentage of the bicarbonate filtered in the glomerulus is reabsorbed under normal conditions along the nephron and in which segment is most of this reabsorption produced ?: 
 Options:  <1> It is reabsorbed almost 100%, mostly in the collector duct. <2> Approximately 50% is reabsorbed, mostly in the proximal convoluted tubule. <3> Approximately 50% is reabsorbed, mostly in the distal convoluted tubule. <4> Less than 20% is reabsorbed, mostly in the collecting duct. <5> It is almost 100% reabsorbed, mostly in the proximal convoluted tubule.
Example Output: 5

Example Input: Question: Indicate the net charge of an amino acid with a neutral R group for a pH value below its pI: 
 Options:  <1> Negative net charge. <2> Positive net charge. <3> Without charge. <4> It is necessary to know the exact pH value to answer this question. <5> It is necessary to know the concentration of the amino acid to answer this question.
Example Output:
2