a) Polyhydrobutyl
b) Polyhydroxybutyrate
c) Polyhydroxybutene
d) Polyhydroxybutane
Answer: b
Explanation: PHB stands for Polyhydroxybutyrate. It is a polyester, popular as a food grade packaging material for snacks, dry products and etc. It is a biodegradable semi-crystalline thermoplastic material produced via fermentation of renewable carbs.
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