Question: what is the purpose of the spleen in a human body
[{'answer': 'a blood filter', 'provenance': [{'wikipedia_id': '42567', 'title': 'Spleen', 'start_paragraph_id': 1, 'start_character': 124, 'end_paragraph_id': 1, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '42567', 'title': 'Spleen', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 161, 'bleu_score': 0.796860748157665, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7953363281302822106}, 'section': 'Section::::Abstract.'}]}]