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: Dental
[{'content': 'Failure to thrive in infants and children results from inadequate nutrition to maintain physical growth and development. It’s a condition usually diagnosed when a child’s weight for age is below________ percentile. \nSelect and explain. \nA. 5th, B. 10th, C. 2nd, D. 15th', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Primary care physician diagnose failure to thrive; when the child’s weight for age is less than fifth percentile or crosses two major percentile lines', 'role': 'assistant'}]