A 42-year-old man presents with generalised oedema, frothy urine and serum albumin 22 g/L. Urinalysis shows protein 4+ and no blood. Cholesterol is elevated. What is the most appropriate next step in management?AReassure and start a loop diuretic onlyBRefer for urgent nephrology assessment and kidney biopsy considerationCStart long-term high-dose steroids without biopsyDTreat with antibiotics for presumed infectionENo further investigation is needed as this is likely transientCheck my answer