This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
The indoor smoke contains a range of health-damaging pollutants, which include all of the following except - 
Select and explain. 
A. Lead oxide, B. Carbon monoxide, C. Sulfur oxides, D. Benzopyrenes
A: Lead oxide
Answer: A: Lead oxide 
Explanation: Carbon monoxide, sulphur oxides and polycyclic aromatic hydrocarbons are from fuel/ coal combustion whereas lead oxide is from remodelling/ demolition of painted surfaces. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 795