Question: what is the contribution of nek chand in the world of art
[{'answer': 'Rock Garden of Chandigarh', 'provenance': [{'wikipedia_id': '700994', 'title': 'Nek Chand', 'start_paragraph_id': 1, 'start_character': 106, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '700994', 'title': 'Nek Chand', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 192, 'bleu_score': 0.9129476313504, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12079869222926147634}, 'section': 'Section::::Abstract.'}]}]