Ans. is 'c' i.e., Glucose-6-phosphataseThe infant is presenting with features of liver glycogenosis, i.e. glycogen storage disease which primarily affects liver.Among the given options a, b and c are liver glycogenoses. but normal glycogen structure rules out a and b options.Debranching enzyme deficiency (Type III glycogenosis) and branching enzyme deficiency (type IV glycogenosis) have depostion of abnormal glycogen.Glucose-6-phosphatase deficiency (type I glycogenosis) has deposition of normal glycogen.