For the reaction 2A ⇌ B + C, what is the correct equilibrium expression?

A. [B][C]/[A]^2
B. [A]^2/[B][C]
C. [B]/[A]^2[C]
D. [B][C]/[A]

Answer: [B][C]/[A]^2


Additional Information: The equilibrium expression is derived from the concentrations of products divided by reactants raised to their coefficients.