Ok, your a doctor in a hospital and for whatever reason you only have 3 pints of a certain blood type available.
Now, everybody is doing very well when all of a sudden a 25 year old tramp is brought into your A&E ward, at the same time the 55 year old prime minister of your country is also brought in.
Both need (amazingly) 3 pints of this blood type to live there is no way of getting any more blood to the hospital before both men die.
Which one would u give the blood to and why ?