Idiom: "at the back of my mind"

[Teodora65]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", question 1

I'm suspicious really because at the back of my ......... I don't trust them.

(a) brain
(b) mind
(c) idea
(d) thought

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #68 "Back Again", answer 1

I'm suspicious really because at the back of my mind I don't trust them.

Correct answer: (b) mind
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I can't understand what does it mean-at/ in the back of your mind?

[Yankee]

Hi teodora65

Something that is "in/at the back of your mind" is something that is understood or known, but is not something you think about actively.

Amy
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"Nearly all men can stand adversity, but if you want to test a man's character, give him power." ~ Abraham Lincoln