[List: Soap, paint, urea, detergent, glass, cement, thermoplastic, calcium-ammonium nitrate, quinine, methane]
Statement: A man-made material used extensively in protecting articles made of wood and iron-___________
Paint is used to protect wood and metal surfaces as it prevents the metal surface from corrosion.
In the case of wood, it prevents the wood from direct contact with air and moisture which can lead to degradation of it.
Most commonly oil paints are used in the surface coating of metals.
So, the correct answer is paint.