A human paladin can take energy resistance as favor class bonus, Pathfinder Advanced Players Guide. Currently I am not allowed to select a type (acid, cold, electricity, fire, or sonic per Resist Energy Spell), I am thinking it should allow me to select one since there is a cap of +10 on it.
Here is the reference in the PRD
Paladin: Add +1 to the paladin's energy resistance to one kind of energy (maximum +10).
Windows 7 64 bit