The enzyme enterokinase helps in the conversion of 

(a) pepsinogen into pepsin

(b) trypsinogen into trypsin

(c) caseinogen into casein

(d) proteins into polypeptides

Audio Explanation:

(b) Enterokinase helps in conversion of trypsinogen into trypsin in small intestine, which is an endoproteolytic enzyme and hydrolyses the peptones and proteoses into peptides.

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