Question: how much did singapore sell christmas island for
[{'answer': 'M $20 million'}, {'provenance': [{'wikipedia_id': '5500', 'title': 'Christmas Island', 'start_paragraph_id': 25, 'start_character': 0, 'end_paragraph_id': 25, 'end_character': 584, 'bleu_score': 0.9521535476876201, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10290866106904616040}, 'section': 'Section::::History.:Transfer to Australia.\n'}]}]