Detailed Instructions: 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: Acetyl-CoA:
Options: <0> It is synthesized from pyruvate in the eukaryotic cytoplasm. <1> It has a phosphate bond rich in energy. <2> Presents a guanine nucleotide in coenzyme A. <3> Activates pyruvate carboxylase and inhibits pyruvate dehydrogenase. <4> It easily crosses the mitochondrial inner membrane.
A:
biology