Question

$\text{NADH}$ is produced in

Answer 1

Biological energy yield

$\text{NADH}$ is a product of cellular respiration which gets oxidised further releasing energy which is utilised for the synthesis of $\text{ATP}.$

Glycolysis is the first step of cellular respiration and yields $2\text{NADH}$ molecules during the oxidation of glucose to pyruvate.

Final answer:

$\left(C\right)$ Glycolysis