Question: what kind of telescope is the chandra observatory
[{'answer': 'X-ray telescopes', 'provenance': [{'wikipedia_id': '217873', 'title': 'Chandra X-ray Observatory', 'start_paragraph_id': 41, 'start_character': 88, 'end_paragraph_id': 41, 'end_character': 104, 'bleu_score': 1.0, 'section': 'Section::::Technical description.\n'}]}, {'provenance': [{'wikipedia_id': '217873', 'title': 'Chandra X-ray Observatory', 'start_paragraph_id': 41, 'start_character': 0, 'end_paragraph_id': 41, 'end_character': 1037, 'bleu_score': 0.9137891709027751, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12295841573367809651}, 'section': 'Section::::Technical description.\n'}]}]