Answer the following question given this paragraph: 

Toxic heavy metals include mercury and lead. Mercury is used in some industrial processes. It is also found in fluorescent light bulbs. Lead was once widely used in gasoline, paint, and pipes. It is still found in some products.


Q: Mercury and lead, which was once widely used in paint and gasoline, are examples of what type of metals?

 Choices:

- gaseous heavy metals

- alloys

- sulfuric heavy metals

- toxic heavy metals

A:
toxic heavy metals
