Question: who is language was used in the literature of sangam period
[{'answer': 'Tamil', 'provenance': [{'wikipedia_id': '4225440', 'title': 'Sangam literature', 'start_paragraph_id': 1, 'start_character': 23, 'end_paragraph_id': 1, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4225440', 'title': 'Sangam literature', 'start_paragraph_id': 1, 'start_character': 53, 'end_paragraph_id': 1, 'end_character': 783, 'bleu_score': 0.61712856215332, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13728177199777949460}, 'section': 'Section::::Abstract.'}]}]