GKFix MCQ Question

What is the correct equilibrium expression for the reaction Ca(OH)2(s) ⇌ Ca²⁺(aq) + 2OH⁻(aq)?

• A. [Ca(OH)2]/[Ca²⁺][OH⁻]^2
• B. [Ca²⁺][OH⁻]^2/[Ca(OH)2]
• C. [Ca²⁺][OH⁻]^2
• D. [OH⁻]^2