Q. Consider the following statements:

1. Caffeine, found in tea and coffee, acts as a diuretic.
2. Citric acid is commonly used in soft drinks.
3. Ascorbic acid is essential for the formation of bones and teeth.
4. Citric acid can adequately substitute for ascorbic acid in human nutrition.

Which of the above statements is / are correct? (UPSC Prelims 2006)
Answer: 1, 2, 3 and 4
Notes: Caffeine is known as a diuretic and is present in tea and coffee. Citric acid is widely used in soft drinks and food items. Ascorbic acid (Vitamin C) is crucial for the formation of bones and teeth, while citric acid is sometimes substituted for ascorbic acid in nutrition and as a preservative, though not identical in properties.