The oxidative phase of the pentose phosphate pathway
a. reversible under physiological conditions.
b. has an enzyme requiring thiamine pyrophosphate as a coenzyme.
c. produces ribulose‑5‑phosphate and nadph for biosynthetic processes.
d. converts pentoses to hexoses.

C: Produces ribulose-5-phosphate and NADPH for biosynthetic processes.

Explanation:

There are two distinct phases in the pathway. The first is the oxidative phase, in which NADPH is generated, and the second is the non-oxidative synthesis of 5-carbon sugars. For most organisms, the pentose phosphate pathway takes place in the cytosol; in plants, most steps take place in plastids.

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c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current