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Commercial cork is obtained from

1. Berberis/Barberry
2. Salix/Willow
3. Quercus/Oak
4. Betula/Birch

Correct answer: Quercus/Oak

Solution

Commercial cork is produced from the bark of cork oak, which belongs to the genus Quercus. The harvested outer bark contains cork tissue used for stoppers and insulation.

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