Question: which is the oldest gospel in the bible
[{'answer': 'Mark', 'provenance': [{'wikipedia_id': '12490', 'title': 'Gospel of Mark', 'start_paragraph_id': 0, 'start_character': 10, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]