Three doctors arrived in heaven. St. Peter asked them why they should be let into heaven.

The first doctor said,″Because I won the Nobel Peace Prize for my work.″ St. Peter let him in.
 
The second doctor said, ″I haven't won any prizes, but I've started free clinics and helped those in need forfree.″ St. Peter let him in.
 
The third doctor said, ″I'm responsible for all the hospitals across the United States.″
 
St. Peter thought about it for a minute and said, ″OK,I'll let you in, but you will be responsible for your safety!″