In guitar music, especially electric guitar, a power chord    (also fifth chord) is a colloquial name for a chord that consists of the root note and the fifth. Power chords are commonly played on amplified guitars, especially on electric guitar with distortion. Power chords are a key element of many styles of rock and especially in heavy metal, and punk rock.
adding the "(meaning lion)  makes the statement neither as it requires outside information to verify and the AI marked it incorrect because the added words confused it.