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

1. The question asks which substances can be found as pollutants in the drinking water in some parts of India. 2. Arsenic (1) contamination in drinking water, primarily from natural geological sources, is a major public health issue in several parts of India, particularly in West Bengal, Bihar, Uttar Pradesh, and Assam. 3. Sorbitol (2) is a sugar alcohol used as a sweetener and humectant. It is not typically considered a significant pollutant in drinking water sources. 4. Fluoride (3) can occur naturally in groundwater. While low levels are beneficial for dental health, high concentrations of fluoride in drinking water (fluorosis) are a widespread problem in many parts of India, causing dental and skeletal issues. 5. Formaldehyde (4) is a volatile organic compound used in various industrial processes and products. While it can be a water pollutant from industrial discharge, it's not typically listed as a widespread, naturally occurring contaminant in drinking water across India in the same way as arsenic or fluoride. 6. Uranium (5) contamination in groundwater, primarily from natural geological sources, has been increasingly reported in several parts of India, including Punjab, Rajasthan, and other states, posing health risks. 7. Therefore, Arsenic, Fluoride, and Uranium are recognized as significant pollutants found in drinking water in some parts of India.