Question: when did india conduct it's first nuclear test at pokhran
[{'answer': '18 May 1974', 'provenance': [{'wikipedia_id': '28853', 'title': 'Smiling Buddha', 'start_paragraph_id': 1, 'start_character': 120, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28853', 'title': 'Smiling Buddha', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 259, 'bleu_score': 0.8474966375582541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14349089610620409138}, 'section': 'Section::::Abstract.'}]}]