Radical 口

9 strokes

mouth 口 (5) + that 那 (98) = which? 哪

This character can also (colloquially) be pronounced něi.

It also has another role, for which the pronunciation is na with neutral tone. this is explained later (see 啊, Character 143).

哪儿 (21) nǎr where (spoken)

[哪个 (19) nǎge which]

(At the dentist) She opens her mouth and points to a tooth, “It’s that one which hurts.” “Which?” asks the dentist (peering more closely). / Teddy, trying to be helpful, has brought along some narcotics in case she needs some…