Question: what is the typical pressure at which an oil burner operates
[{'answer': 'usually 100psi', 'provenance': [{'wikipedia_id': '7062443', 'title': 'Oil burner', 'start_paragraph_id': 20, 'start_character': 228, 'end_paragraph_id': 20, 'end_character': 242, 'bleu_score': 1.0, 'section': 'Section::::Oil pump.:Pressure regulator.\n'}]}, {'provenance': [{'wikipedia_id': '7062443', 'title': 'Oil burner', 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 355, 'bleu_score': 0.9694566079002921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3175498293402604401}, 'section': 'Section::::Oil pump.:Pressure regulator.\n'}]}]