Question: alternative pathway of complement activation is initiated by
[{'answer': 'foreign materials', 'provenance': [{'wikipedia_id': '1140221', 'title': 'Alternative complement pathway', 'start_paragraph_id': 2, 'start_character': 194, 'end_paragraph_id': 2, 'end_character': 211, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'damaged tissues', 'provenance': [{'wikipedia_id': '1140221', 'title': 'Alternative complement pathway', 'start_paragraph_id': 2, 'start_character': 216, 'end_paragraph_id': 2, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the C3b protein directly binds a microbe'}, {'provenance': [{'wikipedia_id': '1140221', 'title': 'Alternative complement pathway', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 231, 'bleu_score': 0.9466178497997021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17998990853042643698}, 'section': 'Section::::Abstract.'}]}]