Question: what is the main source of income in egypt
[{'answer': 'natural gas', 'provenance': [{'wikipedia_id': '9351', 'title': 'Economy of Egypt', 'start_paragraph_id': 23, 'start_character': 32, 'end_paragraph_id': 23, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Reform era.:External trade and remittances.\n'}]}, {'provenance': [{'wikipedia_id': '9351', 'title': 'Economy of Egypt', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 235, 'bleu_score': 0.6124098176472971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5483209745650001754}, 'section': 'Section::::Reform era.:External trade and remittances.\n'}]}]