Table: economy of south america
Question: Are there any countries in South America that use a currency other than their own national currency as the official currency? Answer with only 'Yes' or 'No' that is most accurate and nothing else.
Step 1 (Operation, Indexing): country
Step 2 (Operation, Indexing): currency
Step 3 (Reasoning, Other Commonsense Reasoning): their own national
Step 4 (Reasoning, Reasoning with Quantifiers): existential, other than their own national currency
Answer: Yes