**Category:** Inorganic Chemistry  
**Subtype:** Chemical Compounds  
**Problem Description:** Identify the correct chemical formula for gypsum (thạch cao sống).  

**Options:**  
A. \(\mathrm{CaSO}_{4}\)  
B. \(\mathrm{CaSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}\)  
C. \(\mathrm{CaSO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}\)  
D. \(\mathrm{CaCO}_{3}\)