Is there a key for attacking the enemy with lowest health?

I know the ''c'' button is to attack enemy nearest to u,but is there a key for attacking the lowest hp foe?

Not that I'm aware of, but you can use Tab to cycle through targets.

Look though 'Menu' --> 'Options' --> 'Control Options' to see what commands are available. But there's nothing suitable for your problem unfortunately.

Ok,thanks very much,that helps me much too =)