Pulmonary surfactant is

The correct option is C Phospholipid

• Pulmonary surfactant is a surface-active lipoprotein complex (phospholipoprotein) formed by type II alveolar cells.
• The proteins and lipids that make up the surfactant have both hydrophilic and hydrophobic regions.
• It helps to increase pulmonary compliance, to prevent a collapse of the lung at the end of expiration. Hence, Pulmonary surfactant is a phospholipid.

So, the correct answer is ' phospholipid'.