In which country, a new form gold that is as light as air was created by scientists?

In which country, a new form gold that is as light as air was created by scientists?
[A]Japan
[B]China
[C]Switzerland
[D]France

Switzerland
Switzerland’s researchers have created a lightest form of gold consisting of 98% air, 20-carat gold, and milk protein. The new gold aerogel is made almost entirely of air while retaining the regular metallic sheen of its regular form. The new form of gold has a range of curious properties that give it potential far beyond the jewellery cabinet.

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