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: Social & Preventive Medicine
[{'content': 'By international agreement, low birth weight has been defined as a birth weight when measured within the first hour of life is \nSelect and explain. \nA. Less than 2000 grams, B. Less than 2800 grams, C. Less than 2500 grams, D. Less than 3000 grams', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]