A-LevelBiologyInfectious diseases9700/12 · May/June 2010 · Q21 Mark
Which statement is an example of epidemiological evidence linking smoking to lung cancer?
AChemical analysis of tar from cigarettes shows that it contains carcinogens.
BDogs made to inhale the smoke from cigarettes develop lung tumours.
CThe incidence of lung cancer increases in a population as more cigarettes are smoked.
DWhen tar from cigarettes is rubbed onto the skin of mice, the mice develop skin tumours.
✓ Correct answer
C: The incidence of lung cancer increases in a population as more cigarettes are smoked.
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