Question: what is the most immediate role of water in the light dependent reactions
[{'answer': 'the first electron donor', 'provenance': [{'wikipedia_id': '23982752', 'title': 'Light-dependent reactions', 'start_paragraph_id': 2, 'start_character': 711, 'end_paragraph_id': 2, 'end_character': 735, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23982752', 'title': 'Light-dependent reactions', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 843, 'bleu_score': 0.9659246927162931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 225633162557071757}, 'section': 'Section::::Abstract.'}]}]