"a grain of salt" vs "a grain of sugar"

[Miron]

English Language Tests, Intermediate level

ESL/EFL Test #280 "English Slang Idioms (2)", question 3

Since the man was rather inexperienced, I took his advice with a grain of ..........

(a) sand
(b) wood
(c) salt
(d) sugar

English Language Tests, Intermediate level

ESL/EFL Test #280 "English Slang Idioms (2)", answer 3

Since the man was rather inexperienced, I took his advice with a grain of salt.

Correct answer: (c) salt

Your answer was: incorrect
Since the man was rather inexperienced, I took his advice with a grain of sugar.
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of all the the choices, why salt?

Miron

[Linda]

Hello,
'A grain of salt' is a common idiom. It means that "something should not be blindly accepted and/or believed without any doubt or reservation."
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