Question: who was the song think of laura written about
[{'answer': 'Luke and Laura', 'provenance': [{'wikipedia_id': '18371751', 'title': 'Think of Laura', 'start_paragraph_id': 2, 'start_character': 200, 'end_paragraph_id': 2, 'end_character': 214, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '18371751', 'title': 'Think of Laura', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 702, 'bleu_score': 0.937209132756426, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2901643207942241449}, 'section': 'Section::::Abstract.'}]}]