Some defendants raise what is sometimes called the chrysotile-defense, under which manufacturers of some products containing only chrysotile fibers claim that these are not as harmful as amphibole-containing products. As 95% of the products used in the United States historically were mostly chrysotile, this claim is widely disputed by health officials and medical professionals. The World Health Organization recognizes that exposure to all types of asbestos fibers, including chrysotile, can cause cancer of the lung, larynx, and ovary, mesothelioma, and asbestosis.