The official currency of Japan is:

The question asks for the official currency of Japan. Yen (JPY) is the correct answer, as it is the official currency of Japan and one of the world's major reserve currencies, widely used in international finance and trade.

• The Won is the official currency of South Korea and North Korea.
• The Yuan (specifically Renminbi) is the official currency of the People's Republic of China.
• The Ringgit is the official currency of Malaysia.

Each country typically has its own distinct currency, making it a fundamental aspect of its economic identity.