Question: who was the chief diety of sangam age
[{'answer': 'Sivan', 'provenance': [{'wikipedia_id': '4161033', 'title': 'Sangam period', 'start_paragraph_id': 11, 'start_character': 188, 'end_paragraph_id': 11, 'end_character': 193, 'bleu_score': 1.0, 'section': 'Section::::Culture.:Religion.\n'}]}, {'provenance': [{'wikipedia_id': '4161033', 'title': 'Sangam period', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 900, 'bleu_score': 0.9865312178338931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 890468442454300380}, 'section': 'Section::::Culture.:Religion.\n'}]}]