Incidentally means 'by the way'?

[Honro]

English Idioms and Expressions, Intermediate level

ESL/EFL Test #16 "Way Idioms", question 1

By the way are you thinking of going on holiday?

(a) Incidentally
(b) However
(c) Naturally
(d) Nevertheless

English Idioms and Expressions, Intermediate level

ESL/EFL Test #16 "Way Idioms", answer 1

Incidentally are you thinking of going on holiday?

Correct answer: (a) Incidentally
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i want an explanation of this question

[Mister Micawber]

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'Incidentally' means 'by the way'.
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Native English teacher at Mister Micawber's

[Alan]

Hi Honro,

The word 'incidentally' is often used in conversation when you introduce a new topic and there is no direct reference to what you have said before.

Alan
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English as a Second Language
You can read my ESL story Cool Expressions