Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Dacron is an example of polyester polymer.
Reason R: Dacron is made up of ethylene glycol and terephthalic acid monomers.
In the light of the above statements, choose the most appropriate answer from the options given below.

We need to evaluate the Assertion-Reason statement about Dacron.

The assertion states that "Dacron is an example of polyester polymer." Dacron is the trade name for polyethylene terephthalate (PET), which is indeed a polyester formed by condensation polymerization involving ester linkages; hence the assertion is correct.

The reason states that "Dacron is made up of ethylene glycol and terephthalic acid monomers." Dacron (PET) is formed by the condensation reaction between ethylene glycol (HOCH₂CH₂OH), a diol, and terephthalic acid (benzene-1,4-dicarboxylic acid), a dicarboxylic acid:

$$n\text{HOCH}_2\text{CH}_2\text{OH} + n\text{HOOC-C}_6\text{H}_4\text{-COOH} \rightarrow \text{[-OCH}_2\text{CH}_2\text{OOC-C}_6\text{H}_4\text{CO-]}_n + 2n\text{H}_2\text{O}$$

The reason is correct and explains why Dacron is a polyester, since the formation of ester bonds from a diol and a dicarboxylic acid defines it as a polyester.

The answer is Option A: Both A and R are correct and R is the correct explanation of A.