He is . . . . . . . . good painter.

The correct answer is "a".

The word "a" is used before singular nouns that refer to a general or unspecified person, place, thing, or idea. In this case, the speaker is not referring to a specific painter, but rather to any painter in general.

The word "an" is used before singular nouns that begin with a vowel sound. In this case, the word "painter" does not begin with a vowel sound, so "an" is not the correct answer.

The word "the" is used before singular nouns that refer to a specific person, place, thing, or idea. In this case, the speaker is not referring to a specific painter, but rather to any painter in general.

The word "none of the above" is used when none of the other options are correct. In this case, "none of the above" is not the correct answer, because "a" is the correct answer.