Question: what was the very first power rangers series
[{'answer': 'Mighty Morphin Power Rangers', 'provenance': [{'wikipedia_id': '173486', 'title': 'Power Rangers', 'start_paragraph_id': 1, 'start_character': 486, 'end_paragraph_id': 1, 'end_character': 514, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '173486', 'title': 'Power Rangers', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 716, 'bleu_score': 0.759575306117046, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9784786054383257730}, 'section': 'Section::::Abstract.'}]}]