Which of the following methods is not under scientific scrutiny to help people with weight loss?

Which of the following methods is not under scientific scrutiny to help people with weight loss?

a)  Drugs that block the formation of new fat tissue 

b)  Drugs that mimic some of the thyroid hormones 

c)  Static exercise programs that burn calories during sedentary activities 

d)  Drugs that interfere with the digestion of fat