Which of the following is a cyclic phosphate?

1.	Which of the following is a cyclic phosphate?
A.	\[{{H}_{3}}{{P}_{3}}{{O}_{10}}\]
B.	\[{{H}_{6}}{{P}_{4}}{{O}_{13}}\]
C.	\[{{H}_{5}}{{P}_{5}}{{O}_{15}}\]
D.	\[{{H}_{7}}{{P}_{5}}{{O}_{16}}\]
Answer» D. \[{{H}_{7}}{{P}_{5}}{{O}_{16}}\]

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