Question: who is luke's father in the lightning thief
[{'answer': 'Hermes', 'provenance': [{'wikipedia_id': '21971275', 'title': 'Percy Jackson & the Olympians: The Lightning Thief', 'start_paragraph_id': 6, 'start_character': 360, 'end_paragraph_id': 6, 'end_character': 366, 'bleu_score': 1.0, 'section': 'Section::::Plot.\n'}]}]