Question: based on the residues in the active site what family of proteases does pepsin belong to
[{'answer': 'Acid proteases', 'provenance': [{'wikipedia_id': '57285', 'title': 'Protease', 'start_paragraph_id': 40, 'start_character': 75, 'end_paragraph_id': 40, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Biodiversity of proteases.:Animals.\n'}]}, {'provenance': [{'wikipedia_id': '57285', 'title': 'Protease', 'start_paragraph_id': 40, 'start_character': 0, 'end_paragraph_id': 40, 'end_character': 925, 'bleu_score': 0.985764216565234, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15149122687966046050}, 'section': 'Section::::Biodiversity of proteases.:Animals.\n'}]}]