If the percentage of $Se$ (atomic weight $78.4$) in a peroxidase anhydrous enzyme is $0.5\%$,what is the minimum molecular weight of the peroxidase anhydrous enzyme?
- A$1.568 \times 10^4$
- B$1.568 \times 10^3$
- C$15.68$
- D$2.136 \times 10^4$
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