Question: who wrote lyrics to sign of the times
[{'answer': 'Tony Hatch', 'provenance': [{'wikipedia_id': '5790800', 'title': 'Sign of the Times (Petula Clark song)', 'start_paragraph_id': 1, 'start_character': 316, 'end_paragraph_id': 1, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Jackie Trent', 'provenance': [{'wikipedia_id': '5790800', 'title': 'Sign of the Times (Petula Clark song)', 'start_paragraph_id': 1, 'start_character': 342, 'end_paragraph_id': 1, 'end_character': 354, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]