The cancerogenic chemical that has a very long latent period is -: (A) Benzopyrine, (B) Vinyl chloride, (C) Asbestos, (D) Estrogens
Answer is C. Asbestos exposure for a long period causes asbestosis. They entire the body through inhalation and are deposited in the alveoli. The long exposure of dust can lead to carcinoma of bronchus. (REF. PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 748)