Question: which foreign currency option is the​ right but not the​ obligation to buy foreign​ currency
[{'answer': 'foreign exchange option', 'provenance': [{'wikipedia_id': '1262820', 'title': 'Foreign exchange option', 'start_paragraph_id': 1, 'start_character': 14, 'end_paragraph_id': 1, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'a foreign exchange option ( commonly shortened to just FX option or currency option )'}, {'provenance': [{'wikipedia_id': '1262820', 'title': 'Foreign exchange option', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 327, 'bleu_score': 0.9118021019905901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16448366108014802966}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1262820', 'title': 'Foreign exchange option', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16448366108014802966}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1262820', 'title': 'Foreign exchange option', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['foreign exchange option', 'In finance, a foreign exchange option (commonly shortened to just FX option or currency option) is a derivative financial instrument that gives the right but not the obligation to exchange money denominated in one currency into another currency at a pre-agreed exchange rate on a specified date', 'In finance, a foreign exchange option (commonly shortened to just FX option or currency option) is a derivative financial instrument that gives the right but not the obligation to exchange money denominated in one currency into another currency at a pre-agreed exchange rate on a specified date. See Foreign exchange derivative.']}}]}]