Question: when was 1 rupee coin introduced in india
[{'answer': 'in 1950', 'provenance': [{'wikipedia_id': '1467510', 'title': 'Coins of the Indian rupee', 'start_paragraph_id': 1, 'start_character': 50, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1467510', 'title': 'Coins of the Indian rupee', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 430, 'bleu_score': 0.8274167038304671, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13121799053129064505}, 'section': 'Section::::History.\n'}]}]