The correct answer is option 4, Cinchona. Quinine, an anti-malarial drug, is indeed made from a plant called Cinchona. Cinchona is a tree native to South America, particularly the Andean region. The bark of the Cinchona tree contains the alkaloid compound quinine, which has been used for centuries as a treatment for malaria.

Option 1, Neem, is not the correct answer. Neem is a tree native to India and its extract is known for its various medicinal properties but it is not used in the production of quinine.

Option 2, Eucalyptus, is also not the correct answer. Eucalyptus is a tree native to Australia and its oil has been used for its antimicrobial properties, but it is not involved in the production of quinine.

Option 3, Cinnamon, is not the correct answer either. Cinnamon is a spice made from the inner bark of several tree species, but it is not used in the production of quinine.

Therefore, the correct answer is option 4, Cinchona, as quinine is derived from the bark of the Cinchona tree.