a) Polyester
b) Polypropylene
c) Polyethylene
d) Polystyrene
Answer: a
Explanation: Polyester is the outermost lamination layer in tetrapacks. Polyester provides strength to the tetrapack. It also acts as an excellent printable surface. Polypropylene is the innermost layer, the food contact layer. Polyethylene and polystyrene is not used in tetrapacks.
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