What's the meaning of "tongue"?

[Mango]

English Language Tests, Intermediate level

ESL/EFL Test #707 "English Slang Idioms (449)", question 8

"That was an unfortunate slip of the .......... I know you think she's stupid but did you have to blurt that out when she disagreed with you?" Rachel asked Vincent.

(a) teeth
(b) brain
(c) mouth
(d) tongue

English Language Tests, Intermediate level

ESL/EFL Test #707 "English Slang Idioms (449)", answer 8

"That was an unfortunate slip of the tongue. I know you think she's stupid but did you have to blurt that out when she disagreed with you?" Rachel asked Vincent.

Correct answer: (d) tongue
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What's the meaning of "tongue"?

Mango

[Skrej]

Here's a picture of a tongue.


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Plan to be spontaneous tomorrow.
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Did you hear they arrested the Energizer Bunny on battery charges?
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[Molly]

Skrej's right. A tongue is a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity.
In other uses, it means a) language b)style of expression c) the flap of material under the laces of a shoe or boot d) any long thin projection that is transient e) a metal striker that hangs inside a bell and makes a sound by hitting the side, and more.