This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
[{'content': "Urine dipstick shows result +3. What's the value of protein appearing in mg/dl in urine is: \nSelect and explain. \nA. 100 mg/dL, B. 300 mg/dL, C. 1000 mg/dL, D. 3000 mg/dL", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. 300 mg/dLDipstick urinalysisAmount of protein in the urine0Normal1+30 mg/dL2+100 mg/dL3+300 mg/dL4+1000 mg/dL', 'role': 'assistant'}]