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Which of the following is untrue?

a) Many Vitamin Bs like Vitamin B6 are affected by heating
b) Vitamin C is lost in almost all food processing steps
c) Vitamin C degradation decreases by enzymes and also metals like Cu and Fe
d) Vitamin A is stable in absence of oxygen

Answer: c
Explanation: Vitamin C degradation increases by metals like Cu and Fe and also by the action of enzymes.

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