题目内容：
根据材料，完成题。Free Statim (降胆固醇药物) With Fast Food Could Neutralize Heart Risk Fast food outlets could provide statin drugs free of (51) so that customers can reduce the heart disease dangers of fatty food, researchers at Imperial College London (52) in a new study.
Statins reduce the (53) of unhealthy "LDL" cholesterol (低密度脂蛋白胆固醇) in the blood. A group of trial data has proven them to be highly effective at lowering a person's heart attack (54) In a paper published in the American Journal of Cardiology, Dr Darrel Francis and colleagues calculate that the reduction in heart attack risk offered by a statin is (55) to offset the increase in heart attack risk from (56) a cheeseburger and drinking a milkshake.
Dr Francs, from the National Heart and Lung Institute at Imperial College London, who is the senior author of the study, said: "Statins don't cut out all of the (57) effects of cheeseburgers and French fries. It's better to avoid fatty food altogether. But we've worked out that in terms of your (58) of having a heart attack, taking a statin can reduce your risk to more or less the same (59) as a fast food meal increases it. " "It's ironic that people are free to take as many unhealthy condiments in fast food outlets as they (60), but statins, which are beneficial to heart health, have to be prescribed. It makes sense to make risk-reducing statins available just as easily as the unhealthy condiments that are (61) free of charge. It would cost less than 5 pence per (62) not much different to a sachet of sugar. " Dr Francis said.
When people engage in risky behaviors like driving or smoking, they're encouraged to take63 that lower their risk, like (64) a seatbelt or choosing cigarettes with filters. Taking a statin is a rational way of (65) some of the risks of eating a fatty meal.
请在第__(51)__处填上正确答案。 A．change
B．charge
C．chain
D．chance
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