2011 is the International Year of Chemistry. The theme is "Chemistry - Our Life, Our Future". Which of the following statements is correct ( ) A. Make a space suit

A. The polyester fiber used to make space suits is organic, so A is wrong;

B. The carbonization of coal yields coke, coke oven gas, and coal tar, which cannot be converted into gasoline or diesel, so B is wrong;

C. Transition elements are often used as catalysts, and a small amount of rare earth elements are added to improve the performance of the catalyst, so C is correct;

D. Formaldehyde is toxic and can destroy the structure of proteins. It is not only harmful to the human body, but also reduces the quality of food, so D is wrong.

So choose C.