2days-old new born baby . His mother complained that her baby has difficulty with breathing, fast breathing (more than 60 breaths per minute), a fast heart rate, chest wall retractions (recession), expiratory grunting, nasal flaring and blue discoloration of the skin during breathing efforts. the history of his mother reveals that she gave birth at Twenty-seventh week. so , the doctor diagnosed her baby with respiratory distress syndrome which is associated with pulmonary surfactant deficiency : A) cardiolipin B) phosphatidyle serin C) dipalmitoyl lecithin D) platelet activating factor