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你是哪国人？
Nǐ shì nǎ guó rén? — which country?
You answered a different question: 我叫安。 gives your name.
A
我叫安。Wǒ jiào Ān.My name is An.
Fix
B
我是越南人。Wǒ shì Yuènán rén.I’m Vietnamese.
Clear
C
我喜欢喝茶。Wǒ xǐhuan hē chá.I like drinking tea.
D
地铁站在左边。Dìtiě zhàn zài zuǒbian.The metro is on the left.
你叫什么名字？ — what is your name?
我叫安。 is the reply to that question — the one you tapped.
你是哪国人？ — which country?
我是越南人。 names a country, so it belongs here.
The word that separates them is 叫 jiào, “to be called”, against 哪国 nǎ guó, “which country”. Both replies are good Chinese.