Question: who is percy's father in the lightning thief
[{'answer': 'Poseidon', 'provenance': [{'wikipedia_id': '21971275', 'title': 'Percy Jackson & the Olympians: The Lightning Thief', 'start_paragraph_id': 4, 'start_character': 52, 'end_paragraph_id': 4, 'end_character': 60, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}, {'provenance': [{'wikipedia_id': '21971275', 'title': 'Percy Jackson & the Olympians: The Lightning Thief', 'start_paragraph_id': 17, 'start_character': 0, 'end_paragraph_id': 17, 'end_character': 94, 'bleu_score': 0.5573422396505561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11068974671871884618}, 'section': 'Section::::Cast.\n'}]}]