1
Reason of lung cancer is:
- Calcium fluoride
- Cement factory
- Asbestos
- Bauxite mining
Answer
(3) Asbestos
Solution
As per NCERT, agents that transform normal cells into cancerous neoplastic cells are called carcinogens; they may be physical, chemical or biological agents.
∵ Asbestos is made of very fine fibres; when asbestos dust is inhaled (in asbestos mines, factories and buildings), the fibres lodge in the lungs and are not removed.
⇒ They cause fibrosis of the lungs (asbestosis) and transform lung cells into cancerous cells, so asbestos is a well-known carcinogen of lung cancer (and mesothelioma).
∴ Asbestos is a reason of lung cancer.
Answer: (3)
AIPMT 2001