Question: tcs is in business for number of years
[{'answer': '50', 'provenance': [{'wikipedia_id': '284006', 'title': 'Tata Consultancy Services', 'start_paragraph_id': 2, 'start_character': 408, 'end_paragraph_id': 2, 'end_character': 410, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]