The Yaksha said,—‘Thou hast, O king truly answered who is a man, and what man possesseth every kind of wealth. Therefore, let one only amongst thy brothers, whom thou mayst wish, get up with life!’’ Yudhishthira answered,—‘Let this one that is of darkish hue, whose eyes are red, who is tall like a large Sala tree, whose chest is broad and arms long, let this Nakula, O Yaksha, get up with life!’

In plain words: Pleased, the Yaksha lets Yudhishthira bring back only one of his dead brothers. Yudhishthira chooses Nakula, his tall, dark, strong younger brother.