Correct Option: B

The pentose phosphate pathway (PPP) is a process of glucose turnover that produce NaDPH as reducing equivalents and pentose as essential part of nucleotides. There are two different phases in a pathway. One is irreversible oxidase phase in which glucose-6-phosphate is converted to ribulose-6-phosphate by oxidative decarboxylation and NaDPH is generated. The other is reversible non- oxidative phase in which phosphorylated sugars are interconverted to generate xylulose -5p, ribulose-5p and ribose-5p. Phosphoribosyl pyrophosphate formed from ribose-5p is an activated compound used in the biosynthesis of histidine and purine/pyrimidine nucleotides. This pathway main purpose is to regenerate
NaDP+ through an oxidation/reduction reaction. NaDPH is used for reductive reaction in anabolism, especially in fatty acid synthesis.