How can I check if a trigger is entered on one object with a script on a different object?

So if object A goes into object B and object A has a trigger to make a bool true, how can I make is so object C knows that it’s true and do something because of it?

Here is a quick example (read the comments)

using UnityEngine;
using System.Collections;

public class ObjectA: MonoBehaviour {
pubic bool b;
	void OnTriggerEnter(Collider other)
	{
		//bool set true
	}
}



using UnityEngine;
using System.Collections;

public class ObjectC: MonoBehaviour {

private ObjectA  A;//Our other script

	void Start(){
		A= FindObjectOfType<ObjectA  > ();// Get the other script
	if(A.b == true){
		//Do something
	}
}