Explanation:

- In December 2020, Singapore's hawker culture was added to the UNESCO list of Intangible Cultural Heritage of Humanity.

- Thailand: Known for its street food, but in this context, it wasn't the one recognized by UNESCO in December 2020.

- Singapore: Famous for its diverse and vibrant hawker centers, offering a variety of affordable dishes. Singapore's hawker culture's inclusion in the UNESCO list honors its unique food heritage.

- India: Has a rich culinary tradition, but its hawker culture wasn't added to the list in 2020.

- France: Known for its gastronomy, but not related to the specific hawker culture listing.

- Vietnam: Another country celebrated for its street food, yet not recognized in this instance.