Step 1: Understanding the Question:
The question asks for the incorrect statement about tannins in the context of food chemistry and enzymatic browning.
Step 2: Detailed Explanation:
1. Tannins are polyphenolic compounds naturally present in many fruits and vegetables.
2. When a potato or fruit is cut, cells are damaged, and the enzyme polyphenol oxidase (PPO) comes into contact with tannins and oxygen.
3. This leads to the oxidation of tannins to quinones, which then polymerize to form brown-colored pigments (melanins).
4. Therefore, tannins are the primary cause of browning, not something that avoids it. Statement (A) is definitely incorrect.
5. Note on Statement (C) and (D): While tannins themselves are pre-existing, the complex brown polymers (sometimes referred to in a general sense during the process) are generated during the reaction. However, Statement (A) is the most fundamentally wrong scientific statement here.
Step 4: Final Answer:
Statement (A) is incorrect because tannins are responsible for the browning process, not for avoiding it.