This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fatty acid and synthesis, Subject name: Biochemistry
Acetyl-CoA carboxylase activity requires: 
Select and explain. 
A. Pantothenate, B. Biotin, C. Thiamine pyrophosphate, D. Riboflavin
B: Biotin
Answer: B: Biotin 
Explanation: 4 carboxylases that require biotin Acetyl-CoA carboxylase Pyruvate carboxylase, Propionyl-CoA carboxylase, Methyl-crotonyl coA carboxylase