Question: where did j.c. superstar have it's longest run
[{'answer': 'London', 'provenance': [{'wikipedia_id': '59554', 'title': 'Jesus Christ Superstar', 'start_paragraph_id': 57, 'start_character': 44, 'end_paragraph_id': 57, 'end_character': 50, 'bleu_score': 1.0, 'section': 'Section::::Production.:Other 1970s and 1980s productions.\n'}]}, {'provenance': [{'wikipedia_id': '59554', 'title': 'Jesus Christ Superstar', 'start_paragraph_id': 57, 'start_character': 0, 'end_paragraph_id': 57, 'end_character': 604, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1060536233758900292}, 'section': 'Section::::Production.:Other 1970s and 1980s productions.\n'}]}]