Task: Question Answering
Input (English): Question: The carboxypeptidases A and B: 
 Options:  <1> They are endopeptidases. <2> They are excreted by exocrine cells of the intestine. <3> They are excreted by exocrine cells of the stomach. <4> They are synthesized by endocrine cells of the liver. <5> They are synthesized by exocrine cells of the pancreas.
Output (English): 5