Alternative question : 还是
An alternative question is one formed of two statements joined by 还是 suggesting two different alternatives for the person addressed to choose from.
Example:
你 喝 咖啡 还是 红茶？ Do you drink Coffee or black tea?
你 去 深圳 还是 广州？ Do you go to Shenzhen or Guangzhou?
你 是 美国人 还是 加拿大人？ Are you American or Canadian?