National wealth refers to the sum of various tangible production assets, intangible production assets, natural resources (proven or used for income) and external financial net assets owned by a country at a specific point in time. Which of the following options should not be included in national wealth:. ['0,000 yuan worth of cloth produced by a garment factory.', 'Xiao Wang made a major breakthrough in academic research and obtained a patent.', "China's net external financial assets.", 'Undiscovered gold mines in the mountains.']