Which NOC to Choose-Please Help in choosing correct NOC

[Sri@Dream Canada 99]

Hi everyone ..my self Srivalli a fellow member who is planning to immigrate to canada..
I am Chartered Accountant(CA) by profession.However the main work I do is Information Technolgy Audit (IT ) audit which falls under NOC 2171.
But i see for CA's there is specific NOC code 1111 .
I have doubt which NOC i have to choose now.
It will be really helpful if any one of you can reply.