Question: what do glow plugs do in a diesel engine
[{'answer': 'start the engine', 'provenance': [{'wikipedia_id': '12004340', 'title': 'Glowplug', 'start_paragraph_id': 1, 'start_character': 1047, 'end_paragraph_id': 1, 'end_character': 1063, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12004340', 'title': 'Glowplug', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1063, 'bleu_score': 0.9597125941441801, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10104349540198627874}, 'section': 'Section::::Abstract.'}]}]