This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'A Protein estimation test is confused with \nSelect and explain. \nA. Phosphates, B. Nitrates, C. Sulphates, D. Bile salts', 'role': 'user'}, {'content': 'Answer: A \nExplanation: On heating the urine, turbidity arises if proteins are present.\nHowever, turbidity also arises if phosphates or carbonates are present in urine. This can leads to confusion.\nAddition of few drops of acetic acid dissolves the turbidity due to phosphates or carbonates, whereas turbidity due to proteins remains persistent.', 'role': 'assistant'}]