Destroy object on click? UNITY

Hi guys!
lets say I have Object A and Object B.
I want…
if i click Object A then I want Object B to get destroyed.
How do I do that in unity???

It would look something like this.

using UnityEngine;
using System.Collections;

public class DestoryObject : MonoBehaviour 
	public GameObject objectToDestroy;

	void OnMouseDown () 

You would put this script on object A and drag objectB into the objectToDestroy slot in the editor.

what about click twice to destroy