This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Environment and health, Subject name: Social & Preventive Medicine
[{'content': 'Eutrophication of water bodies is mainly caused by - \nSelect and explain. \nA. Carbonates and oxides, B. Hydrocarbons and mentals, C. Carbonates and sulphates, D. Phosphates and nitrate', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Eutrophication or hyperophication, is when a body of water becomes overly enriched with minerals and nutrients which induce excessive growth of algae. This process may result in oxygen depletion of the water body. One example is an "algal bloom" or great increase of phytoplankton in a water body as a response to increased levels of nutrients. Eutrophication is often induced by the discharge of nitrate or phosphate-containing detergents, feilizers, or sewage into an aquatic system. Ref: https://en.m.wikipedia.org/wiki/Eutrophication', 'role': 'assistant'}]