Unity know when gameobject presed

void Update () {
         if (Input.GetMouseButtonDown(0)) {
             CastRay();
         }       
     }

     void CastRay() {
         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
         RaycastHit2D hit = Physics2D.Raycast (ray.origin, ray.direction, Mathf.Infinity);
         if (hit.collider !=null) {
             Debug.Log (hit.collider.gameObject.name);
     }

Source: stackoverflow.com

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