In WHO growth chart 'Lower reference curve' represents

(A) 3rd percentile > WHO reference curves are based on extensive cross-sectional data of well-nourished healthy children, assembled by the United States National Centre for Health Statistics (NCHS), which are considered the best available for international use.# WHO growth chart> The upper reference curve represents the median (50th percentile) for boys (slightly higher than that for girls), and the lower reference curve the 3rd percentile for girls (slightly lower than that for boys).> Thus the chart can be used for both sexes.