Which of the following can be found as pollutants in the drinking water in some parts of India?<br/>1. Arsenic<br/>2. Sorbitol<br/>3. Fluoride<br/>4. Formaldehyde<br/>5. Uranium<br/><br/>Select the correct answer using the codes given below.

1. Arsenic — Correct. Arsenic contamination of groundwater is a well-known problem in parts of India, especially in the Ganga-Brahmaputra plains.

2. Sorbitol — Incorrect. Sorbitol is a sugar alcohol used in food/pharma; it is not recognized as a typical drinking-water pollutant issue in India.

3. Fluoride — Correct. Excess fluoride in groundwater is a major drinking-water contaminant in several Indian states and can cause fluorosis.

4. Formaldehyde — Incorrect. Formaldehyde is not a standard naturally occurring or commonly reported widespread drinking-water pollutant in India in this context.

5. Uranium — Correct. Uranium contamination has been reported in groundwater in some parts of India, including Punjab and other regions.

Hence, the correct set is 1, 3 and 5 only.