【单选题】Pulmonary delivery system is an alternative to parenteral administration of peptides and proteins because_______.
A.
It can avoid hydrolysis and degradation of peptides and proteins in the GI tract.
B.
It has higher delivery efficiency for peptides and proteins.
C.
It can prolong the elimination half-life of peptides and proteins.
D.
It can increase the target specificity of peptide and protein drug.