Question: what are the various hydrocarbons present in crude oil
[{'answer': 'Alkanes', 'provenance': [{'wikipedia_id': '23195', 'title': 'Petroleum', 'start_paragraph_id': 42, 'start_character': 158, 'end_paragraph_id': 42, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Chemistry.\n'}]}, {'answer': 'Naphthenes', 'provenance': [{'wikipedia_id': '23195', 'title': 'Petroleum', 'start_paragraph_id': 40, 'start_character': 146, 'end_paragraph_id': 40, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Chemistry.\n'}]}, {'answer': 'Aromatics'}, {'answer': 'Asphaltics'}]