'stick by him' vs 'stick from him'

[Vagit]

English Language Tests, Intermediate level

ESL/EFL Test #242 "A Sticky Moment", question 4

He made a good friend that first day who advised him to stick ......... him and ignore what anyone said.

(a) from
(b) across
(c) down
(d) by

English Language Tests, Intermediate level

ESL/EFL Test #242 "A Sticky Moment", answer 4

He made a good friend that first day who advised him to stick by him and ignore what anyone said.

Correct answer: (d) by

Your answer was: incorrect
He made a good friend that first day who advised him to stick from him and ignore what anyone said.
_________________________

Why this is put in the sentence by not from?

Vagit

[Mister Micawber]

.
'Stick from him' makes no sense in English to me, Learner-- what do you think it may mean?

On the other hand, 'stick by' means rely on, stay with, be loyal to.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber