A 30-year-old male presented to the OPD with complaints of dark-coloured urine for 1 week. The episodes usually occur in the night. No splenomegaly was observed on examination. Lab findings revealed, Increased indirect bilirubin Hemoglobinemia and hemoglobinuria Absent haptoglobin Raised LDH Hemosiderinuria Reticulocytosis Flow cytometry studies were done The drug which has been approved for the above condition works by blocking which component of the complement system: -