Question: how does the sperm cell penetrate an egg
[{'answer': 'acrosome reaction', 'provenance': [{'wikipedia_id': '443228', 'title': 'Acrosome reaction', 'start_paragraph_id': 1, 'start_character': 364, 'end_paragraph_id': 1, 'end_character': 381, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '443228', 'title': 'Acrosome reaction', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 552, 'bleu_score': 0.9470575400422261, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9396994114919112816}, 'section': 'Section::::Abstract.'}]}]