哪 + Measure Word + Noun
哪 (nǎ) is a question word meaning "which" or "what." It is placed before a measure word and noun to ask someone to identify or select from a group, as in 哪个 (nǎ ge, "which one"). It can also mean "where" when used as 哪里 or 哪儿.
你想去哪个餐厅吃饭?
Nǐ xiǎng qù nǎge cāntīng chīfàn?
Which restaurant do you want to go to for dinner?
这些颜色你喜欢哪个?
Zhèxiē yánsè nǐ xǐhuān nǎge?
Which of these colors do you like?
你是哪年来中国的?
Nǐ shì nǎ nián lái Zhōngguó de?
What year did you come to China?