Question: why did star trek change from pike to kirk
[{'answer': 'The Menagerie', 'provenance': [{'wikipedia_id': '100275', 'title': 'Christopher Pike (Star Trek)', 'start_paragraph_id': 1, 'start_character': 664, 'end_paragraph_id': 1, 'end_character': 677, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '100275', 'title': 'Christopher Pike (Star Trek)', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 982, 'bleu_score': 0.9878413801697931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11718219779728194635}, 'section': 'Section::::Depiction.:"The Menagerie".\n'}]}]