**Category:** Organic Chemistry  
**Subtype:** Chemical Reactions (Hydrolysis)  
**Problem Description:** This problem involves the hydrolysis of triolein in a sodium hydroxide (NaOH) solution, leading to the formation of glycerol and a salt (X). The task is to identify the correct chemical formula for the salt produced from the reaction.  

**Key Points:**  
- **Substance Involved:** Triolein, a triglyceride.  
- **Reaction Type:** Hydrolysis in a basic medium (saponification).  
- **Products:** Glycerol and a sodium salt of fatty acid.  
- **Goal:** Determine the correct formula for the salt (X) from the given options.