Which statement about mold growth is true?

• A. Mold grows especially well in acidic foods with little moisture; refrigerator and freezers slow their growth but do not kill them.
• B. Mold requires high moisture and neutral pH to grow.
• C. Refrigeration kills mold instantly.
• D. Mold cannot produce toxins.

Answer: (A)

Mold growth in foods is influenced by moisture and acidity, and some molds can persist in acidic foods even when moisture is not high. The idea is that mold doesn’t need perfectly wet, neutral conditions to survive; in acidic foods with limited free water, certain molds still find enough water activity to grow, especially when nutrients are available. Refrigeration and freezing slow mold growth by keeping temperatures low and water activity reduced, but they don’t instantly kill existing mold or its spores.

That’s why this statement is considered true: mold can thrive in acidic environments and on foods with reduced moisture, and cold storage merely slows growth rather than eliminating it. The other points aren’t as accurate—molds do require some moisture (not strictly high moisture and neutral pH in all cases), refrigeration doesn’t kill mold instantly, and mold can produce toxins.