Question: what is the fifth letter of the greek alphabet
[{'answer': 'epsilon', 'provenance': [{'wikipedia_id': '715909', 'title': 'Greek alphabet', 'start_paragraph_id': 26, 'start_character': 397, 'end_paragraph_id': 26, 'end_character': 404, 'bleu_score': 1.0, 'section': 'Section::::History.:Origins.\n'}]}]