**Category:** Inorganic Chemistry  
**Subtype:** Chemical Reactions  
**Problem Description:** Identify which substance dissolves when reacted with dilute NaOH solution.  

**Options:**  
A. MgO  
B. CuO  
C. \(\mathrm{Fe}_{2} \mathrm{O}_{3}\)  
D. \(\mathrm{Al}_{2} \mathrm{O}_{3}\)