Water Pollution

Water pollution is a significant environmental issue that can lead to various health problems. Among the diseases listed, diarrhoea is commonly associated with water pollution. Contaminated water often contains pathogens such as bacteria, viruses, and parasites which can lead to gastrointestinal infections, the most prevalent being diarrhoea. This condition leads to dehydration and can be particularly dangerous for young children and the elderly.

In contrast, conjunctivitis, respiratory infections, and bronchitis are not directly linked to water pollution. Conjunctivitis is usually caused by viral or bacterial infections, allergic reactions, or irritants, while respiratory infections and bronchitis are primarily caused by airborne pollutants or infectious agents, not through water.

Thus, the correct answer concerning a disease commonly caused by water pollution is diarrhoea.