Lead is commonly found in which of the following sources?

• A. Paint
• B. Gas
• C. Water
• D. Pipes

Answer: (A)

Lead exposure from paints is a classic example of how a common consumer product can become a major source of toxicity, especially in older buildings. Lead was widely used in paints as pigments and as a drying agent, so deteriorating or chipping paint creates dust and small chips that can be ingested or inhaled, a major route of exposure for children who come into contact with painted surfaces.

Gasoline used to contain lead, but this has been largely phased out in many countries, so it is no longer a common ongoing source. Water and pipes can contribute to lead exposure through leaching from lead-containing materials, especially in older plumbing, but this exposure tends to be less uniformly present than dust from historic paint in many settings.

Therefore, paint stands out as the most commonly encountered source among the options.