Task: Pos Tagging
Input (English): Sentence: Treatment of the conjugates with ethyl acetate , and the conjugates ( which had been passed through Dowex-2-chloride ) with mouse liver powder , sweet clover crown gall tissue powder , {{ or }} healthy sweet clover proteins did not satisfactorily remove nonspecifically staining substances in the conjugates . 
Word: or
Output (English): CONJ