This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
Study the given curve, comment on the finding? 
Select and explain. 
A. A is related with myoglobin and B is related with hemoglobin, B. B is related with myoglobin and A is related with hemoglobin, C. Both are related with myoglobin, D. Both are related with hemoglobin
B: B is related with myoglobin and A is related with hemoglobin
Answer: B: B is related with myoglobin and A is related with hemoglobin 
Explanation: Myoglobin is an iron-containing pigment found in skeletal muscle.It resembles hemoglobin but binds 1 rather than 4 molecules of O2 per mol.Because its curve is to the left of the hemoglobin curve, it takes up O2 from hemoglobin in the blood. It releases O2 only at low PO2 values, but the PO2 in exercising muscle is close to zero.