This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hemolytic Anemia, Subject name: Medicine
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 Blood withdrawn shows thick brownish red color.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? 
Select and explain. 
A. Sickle cell anemia,, B. Hemolytic anemia, C. Meth-hemoglobinaemia, D. G-6-P-deficiency
C: Meth-hemoglobinaemia
Answer: C: Meth-hemoglobinaemia 
Explanation: 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.