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# Which of the following biogradable polymer is used in speciality packaging and as drug capsules?

$\begin{array}{1 1}(a)\;\text{Nylon-2,6}\\(b)\; \text{Polyglycolic acid}\\(c)\;\text{Polyactic acid}\\(d)\;\text{PHBV}\end{array}$

Poly$-\beta$-hydroxybutyrate-CO-$\beta$-hydroxyvalerate(PHBV) is a copolymer of 3-hydroxybutanoic acid and 3-hydroxypentanoic acid,in which the monomer units are joined by ester linkages.
The property of PHBV vary according to the ratio of both the acids.3-hydroxy butanoic acid provides stiffners while 3-hydroxypentanoic acid gives flexibility to the copolymer .
When a drug is enclosed in a capsule of PHBV,it is released only when the polymer is degraded in the body.PHBV is used in speciality packaging,orthopaedic devices and in controlled release of drugs.
Hence (d) is the correct answer.