In bronchopulmonary dysplasia, the lungs of newborns become inflamed and scarred. Most infants with this condition recover, but some die. An experimental treatment cultures stem cells from a newborn's umbilical cord. The stem cells, in a lab dish, give rise to type II cells, which in turn give rise to more type I cells. In this treatment

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In bronchopulmonary dysplasia, the lung tissue becomes inflamed and scarred, leading to respiratory distress. Type II cells present in the lungs are responsible for producing surfactant, which reduces surface tension and prevents the alveoli from collapsing. The experimental treatment uses stem cells from the newborn's umbilical cord, which can differentiate into type II cells and, subsequently, type I cells. The type II cells formed in the lab dish are expected to secrete surfactant, while the type I cells form the respiratory membrane, facilitating gas exchange. Therefore, choice B is the best answer.

In Bronchopulmonary Dysplasia, the Lungs of Newborns Become Inflamed and Scarred