a/an (good) explanation

[hongover]

Hi all,

I wonder whether "()" affects our use of "a" or "an". For example, should I say (please ignore the context):

1. Let me give you a (good) explanation; or
2. Let me give you an (good) explanation.

Thank you.

 

[grassy]

It's always a good explanation.

 

[JulianStuart]

The choice between a and an is determined solely by the (sound of the beginning of the) word which follows immediately after it:

a good explanation
an explanation