In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Q: Question: Pyruvate dehydrogenase (PDH):
Options: <0> It catalyzes the reversible transformation of pyruvate into acetyl-CoA and vice versa. <1> It catalyzes the irreversible carboxylation of pyruvate into citrate, and with it, its entry into the citric acid cycle. <2> It connects the degradation of carbohydrates, with the synthesis of acetyl-CoA and its entry into the citric acid cycle. <3> It allows the use of acetyl-CoA derived from the degradation of fatty acids for the synthesis of glucose. <4> It is activated in the presence of high concentrations of acetyl-CoA and NADH + H +.
A:
pharmacology