Which of the following is a biodegradable polymer?
- A$[-NH-(CH_2)_5-CO-NH-CH_2-CO-]_n$
- B$[-NH-(CH_2)_5-CO-]_n$
- C$[-NH-(CH_2)_6-NH-CO-(CH_2)_4-CO-]_n$
- D$[-CO-C_6H_4-COO-(CH_2)_2-O-]_n$
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