<prompt> 60 year old person presents with history of angina and shortness of breath for the past week. Blood withdrawn shows thick brownish red color. Diagnosis?Sickle cell anemia,Hemolytic anemiaMeth-hemoglobinaemiaG-6-P-deficiency  <response>: Ans. c Meth-hemoglobinaemiaRef.: Harrison 19th ed. 636 Sickle cell anemia has a pediatric presentation. Hemolytic anemia will cause pallor and not brown discoloration of blood. In G6PD in event of intravascular hemolysis the hemoglobinuria will cause a black urine. Therefore by exclusion also the answer is meth-hemoglobinaemia. 