What is the chemical formula of Plaster of Paris?
Options:
- A: $\text{CaSO}_4\cdot2\text{H}_2\text{O}$
- B: $\text{CaSO}_4\cdot\frac{1}{2}\text{H}_2\text{O}$
- C: $\text{CaCO}_3$
- D: $\text{CaO}$
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