What is the test for a jury to determine whether a plaintiff is injured in a motor vehicle accident?

"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."' [Citations.]" (People v. Escobar (1992) 3 Cal.4th 740, 750.)