Nephrology MCQ for NEET PG & FMGE

A 64-year-old woman with BP 162/90mmHg on routine checkup 6 months ago (normal urinalysis and renal function) was started on captopril. Now presents with polyuria, fatigue, BP 190/110mmHg, UA: protein+, renal function: BUN 16mmol/L, Cr 324μmol/L, serum K+ 3.0mmol/L. Renal ultrasound: left kidney 11.8cm×5.2cm, right kidney 9.0cm×3.8cm. The most likely diagnosis is:

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