Answer this

A man driving a car in a storm. He reached at a bus stop there are three people in line waiting for bus. First is a old lady who is in condition as she can die anytime. Second one is his very good friend who has saved his life before and third is a person who is perfect life partner for him.He is having place for only one preson in his car. So he can save life of only one person among the three. Whos life he will save?