Question

in certain families with a high incidence of emphysema, there is a hereditary deficiency of:
carcinoembryonic antigen
alpha - 1 antitrypsin deficiency
beta - lipoprotein lipase
alpha - fetoprotein

Explanation:

To solve this, we analyze each option:

• Carcinoembryonic antigen is related to cancer, not emphysema.
• Alpha - 1 antitrypsin deficiency is a known hereditary condition associated with emphysema, as this protein protects the lungs from damage; its deficiency can lead to emphysema, especially in families with high incidence.
• Beta - lipoprotein lipase is related to lipid metabolism, not emphysema.
• Alpha - fetoprotein is related to liver cancer and fetal development, not emphysema.

Answer:

B. alpha - 1 antitrypsin deficiency