Task: Question Answering
Input (English): 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.
Output (English): 5