Question: what are the two basic categories of items on an income statement
[{'answer': 'revenues', 'provenance': [{'wikipedia_id': '312893', 'title': 'Income statement', 'start_paragraph_id': 1, 'start_character': 351, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'expenses', 'provenance': [{'wikipedia_id': '312893', 'title': 'Income statement', 'start_paragraph_id': 1, 'start_character': 364, 'end_paragraph_id': 1, 'end_character': 372, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]