A 42-year-old woman from Mumbai with chronic hepatitis B (HBsAg+, anti-HBc+, HBeAg−, anti-HBe+, HBV DNA 2×10^4 copies/mL) and normal liver histology on biopsy is found to have lamivudine-resistant HBV (YMDD mutation). What is the drug of choice for salvage therapy?

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