A#.
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The mediant of any major scale is the note that is a third above the tonic (root) of the scale. In the key of F sharp major, the tonic is F sharp, so the mediant would be A sharp.
G major, D major, E major, B major, F sharp major, F sharp minor, A sharp major, etc.
The dominant in a scale is the 5th, which in the key of F# major is C#.
The G-major scale has only one sharp (which is F#)
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
G Major has one sharp, which is F sharp.