Golden blood type

Lu Mengjie was pacing back and forth in front of the emergency room. She was getting even more anxious as she waited outside.

Just then, a nurse urgently came out of the room. "Excuse me, are you a relative of the patient?"

She quickly approached the nurse as she replied, "I am his wife." 

"The patient is losing too much blood. We need to give him a transfusion as soon as possible," the nurse informed Lu Mengjie who was currently standing in front of the emergency room. "The thing is, we currently don't have an Rh null AB-type stock in our blood bank so we have contacted another blood bank for it…" 

"Rh null?" She asked in confusion.

"This is the rarest blood group in the world, with less than 50 individuals having this blood group," the nurse explained. "If the blood won't come in time, I'm afraid that we won't be able to…" she paused and was hesitant to continue. "Do you know anyone who has the same blood type as him?"