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    at risk of tissue hypoxia because CO causes

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    Patient A is suffering from carbon monoxide (CO) poisoning and patient
    B has iron deficiency anemia. Assume that CO is binding 50% of the
    available O2-binding sites on the hemoglobin, and that the anemic
    patient has 50% of the normal amount of hemoglobin. Patient A is
    more at risk of tissue hypoxia because CO causes

    A. a decrease in diffusing capacity
    B. a decrease in the P50 of Hb for O2
    C. a greater decrease in the concentration of arterial oxygen
    D. a reduced rate of O2 binding to available Hb
    E. arterial hypoxemia, while anemia does not

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    answer is B

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