Make text appear when object is clicked

 using UnityEngine;
 using System.Collections;
 
 class ShowTextButton : MonoBehavior
 {
     private bool showText = false;
     // Create a bool to say whether to show the button or not
     
     void OnMouseDown()
     {
         if(!showText)
             showText = true;
         // If you clicked the object, set showText to true
     }
     
     void OnGUI()
     {
         if(showText)
         {
             // If you've clicked the object, show this button
             if(GUI.Button(new Rect(100,100,100,20), "Click To Close"))
                 // If you click this button, set showText to false
                 showText = false;
         }
     }
 }