Effects of cholesterol on the lipid membrane--BR inconsistency

This is probably a very minute detail, but it's bugging me because BR states two different things. On page 34 of their bio II book, it says "Addition of cholesterol to a membrane acts to decrease fluidity. The planar ring inserts between neighboring fatty acid side chains and interferes with the movement of those chains."


And then in passage X, there is a question that asks about the effect of cholesterol on the membrane. The 'correct' answer choice is that "cholesterol has the effect of...

Effects of cholesterol on the lipid membrane--BR inconsistency