Which of the following words is closest in meaning to “Oracle”?

Oracle means a person regarded as a source of wise advice.

• Correct answer - wise person: it has the same meaning as Oracle.
• idiot: a very foolish person - wrong, it does not mean the same as Oracle.
• round opening: a circular hole - wrong, it does not mean the same as Oracle.
• speaker: a person who speaks - wrong, it does not mean the same as Oracle.