Question: what are the main components of steam power plant
[{'answer': 'Water', 'provenance': [{'wikipedia_id': '2549543', 'title': 'Thermal power station', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 165, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'steam turbine', 'provenance': [{'wikipedia_id': '2549543', 'title': 'Thermal power station', 'start_paragraph_id': 1, 'start_character': 206, 'end_paragraph_id': 1, 'end_character': 219, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'electrical generator', 'provenance': [{'wikipedia_id': '2549543', 'title': 'Thermal power station', 'start_paragraph_id': 1, 'start_character': 236, 'end_paragraph_id': 1, 'end_character': 256, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2549543', 'title': 'Thermal power station', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 936, 'bleu_score': 0.912146432645996, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6962906434811311846}, 'section': 'Section::::Abstract.'}]}]