RE: Maths Brain Teasers 64:: Can You - Eliminate the Odd Clock Out???

My guess will be that Clock B is the odd one out.

The Pattern I found for was if a clock was AB:CD then the corresponding pattern clock is BA:DC.

So 12:11 --> 21:11 and 11:15 --> 11:51. These four numbers are on the available solutions.
However 11:21 would require 11:12 to be on the list and it isn't.