What are the MR severity thresholds by EROA?

• A. Mild MR: EROA < 0.20 cm^2; Moderate MR: 0.20–0.39 cm^2; Severe MR: ≥ 0.40 cm^2
• B. Mild MR: EROA ≥ 0.40 cm^2
• C. Moderate MR: EROA < 0.10 cm^2
• D. Severe MR: EROA < 0.15 cm^2

Answer: (A)