This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and Health, Subject name: Social & Preventive Medicine
[{'content': "In WHO 'Road to health card' (growth chart) the upper reference line represents: \nSelect and explain. \nA. 80th percentile for boys, B. 50th percentile for girls, C. 80th percentile for girls, D. 50th percentile for boys", 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. D. 50th percentile for boys. (Ref. Park's Textbook of PSM 22nd/pg. 506)Discussion:WHO growth chart# WHO growth chart is having 2 reference curves.# The upper reference curve represent the median (50th percentile) for boys and the lower reference curve the 3rd percentile for girls.# The space between the two growth curves is called as road to health. This will include the zone of normality.# The Indian growth chart is having 4 reference curves.# The topmost curve corresponds to 80 % of the median of the WHO reference standard.# The lower lines represent 70 %, 60 %, 50 % of that standard.", 'role': 'assistant'}]