Question: who wrote the text amarkosha during the gupta age
[{'answer': 'Amarasimha', 'provenance': [{'wikipedia_id': '4565774', 'title': 'Amarakosha', 'start_paragraph_id': 1, 'start_character': 220, 'end_paragraph_id': 1, 'end_character': 230, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '4565774', 'title': 'Amarakosha', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 400, 'bleu_score': 0.916705652864192, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 291650336141982247}, 'section': 'Section::::Abstract.'}]}]