Question: which surah is known as the heart of the quran
[{'answer': 'Yāʾ - Sīn'}, {'provenance': [{'wikipedia_id': '1345282', 'title': 'Ya-Sin', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 829, 'bleu_score': 0.9671679735406701, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1186984259243891764}, 'section': 'Section::::Heart of the Quran.\n'}]}]