Which of the following vitamins can be toxic if consumed in large amounts?
1. Niacin
2. Vitamin C
3. Vitamin A
4. Folic acid
Correct Answer: 3
Rationale 1: Niacin is vitamin B, and therefore water-soluble.
Rationale 2: Vitamin C is a water-soluble vitamin, and cannot be toxic.
Rationale 3: Vitamin A is lipid-soluble, and can be toxic in large amounts.
Rationale 4: Folic acid is a B vitamin, and is water-soluble.
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