Bajra, Barley, and Rice are all cereals or grains primarily grown for their seeds, which are used as staple food crops. Mustard is primarily an oilseed crop, grown for its seeds that are processed to produce mustard oil or used as a spice.
Since mustard serves a different primary purpose (oil production or seasoning) compared to the others (staple food grains), it is the odd one out.
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