A 68-year-old patient with rheumatoid arthritis has a sudden drop in haemoglobin, elevated bilirubin, and reticulocytosis. Direct antiglobulin (Coombs) test is positive. Which complication is this?AIron deficiency anaemiaBAnaemia of chronic diseaseCWarm autoimmune haemolytic anaemiaDCold agglutinin diseaseEAplastic anaemiaCheck my answer