difference between tip of my tongue and tip of my brain?

[pravaash]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #544 "English Slang Idioms (147)", question 6

"The name of the city official in charge of making sure that buildings adhere to the building codes is right on the tip of my .......... I just talked to him last week. I am sorry. I can't remember his name right now but I will call you if I remember," Tina told Phil.

(a) thoughts
(b) brain
(c) memory
(d) tongues

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #544 "English Slang Idioms (147)", answer 6

"The name of the city official in charge of making sure that buildings adhere to the building codes is right on the tip of my brain. I just talked to him last week. I am sorry. I can't remember his name right now but I will call you if I remember," Tina told Phil.

Correct answer: (b) brain
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whats the difference between tip of my tongue and tip of my brain? the former means which cant be recalled immediately.
also whats the difference between "at" the tip of my tongue and "on" the tip of my tongue

pravash

[Mister Micawber]

.
There is no difference between 'at/on the tip of my tongue'; they are merely two variants of the idiom. 'Tip of my brain' is not an English idiom. This question needs repair. I'll see if I can do that now.
.
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Native English teacher at Mister Micawber's

[Mister Micawber]

.
No, sorry-- I cannot reach that one. The correct answer should be 'tongue' (not 'tongues'). Another member of our team will fix that soon.
.
_________________
Native English teacher at Mister Micawber's

[Linda]

Yes, the answer is tongue and that will be fixed right away.
As far as your other question Pravash, "tip of my tongue" is the right expression when you can't recall something. Tip of my brain is not the right common phrase. As far as I know, tip of my brain is not an idiom at all.
_________________
One Way of Learning English Grammar
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[Linda]

That mistake in the question is fixed now. Thanks for pointing it out.
_________________
One Way of Learning English Grammar
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