What is the test for a jury to determine whether the harm caused to the victim is "great bodily injury"?

"'It is well settled that the determination of great bodily injury is essentially a question of fact, not of law. "'Whether the harm resulting to the victim . . . constitutes great bodily injury is a question of fact for the jury. [Citation.] If there is sufficient evidence to sustain the jury's finding of great bodily injury, we are bound to accept it, even though the circumstances might reasonably be reconciled with a contrary finding.'"' [Citation.]" (People v. Mendias (1993) 17 Cal.App.4th 195, 205.)