Asbestos-the correct answer is b. this image demonstrates an advanced case of mesothelioma, in which the entire left lung is encased with tumor. the clinical history supports this diagnosis. asbestos is present in certain building materials and fi re-resistant materials, and exposure to asbestos is a risk factor for the development of mesothelioma.
answer a is incorrect. afl atoxin b is produced by aspergillus and is a common contaminant of cereals, spices, and nuts. it has been associated with carcinoma of the liver.
answer c is incorrect. long-term exposure to high levels of benzene can lead to leukemia and hodgkins lymphoma. benzene is the main component of light oil, and is found in gasoline and other fuels.
answer d is incorrect. cadmium is a carcinogen associated with the development of prostate
cancer. it can be found in batteries and in metal coatings.
answer e is incorrect. exposure to silica may occur in the manufacturing of several materials,
such as glass, ceramics, and electronics. silicosis is characterized by bilateral, fi ne nodularity in
the upper lung lobes. it is slowly progressive. its role as a carcinogen is controversial.
