Question: when does lent start in the catholic church
[{'answer': 'on Ash Wednesday', 'provenance': [{'wikipedia_id': '21324653', 'title': 'Lent', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]