Question: when was the first guru granth sahib written
[{'answer': '16th century', 'provenance': [{'wikipedia_id': '520887', 'title': 'Guru Granth Sahib', 'start_paragraph_id': 16, 'start_character': 112, 'end_paragraph_id': 16, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Composition.\n'}]}, {'provenance': [{'wikipedia_id': '520887', 'title': 'Guru Granth Sahib', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 641, 'bleu_score': 0.981898582188057, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12117183554813773794}, 'section': 'Section::::Composition.\n'}]}]