<prompt> A 60-year-old industrial worker presents with shortness of breath for the past week. Blood withdrawn shows thick brownish red Color. Diagnosis?Sickle cell anemiaHemolytic anemiaMeth-hemoglobinemiaG-6-P-deficiency  <response>: Ans. C. Meth-hemoglobinemia 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 the answer is meth-hemoglobinuria. 