[单选题]
______
A .Second, I could lower my blood cholesterol level simply by changing what I ate.
B .I was three years old at that time.
C .There is not enough oxygen in the blood.
D .It was a heart attack just waiting to happen
E .The trial was designed to test the effect of lowering blood cholesterol on the risk of heart disease.
F .The death rate for the test was only 1 in 100, I was assured.
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