This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Which of the following enzymes contain manganese as its cofactor? 
Select and explain. 
A. LDH, B. Arginase, C. Hexokinase, D. DNA polymerase
B: Arginase
Answer: B: Arginase 
Explanation: Manganese: Cofactor for enzymes, e.g., arginase, pyruvate carboxylase.
Enzymes that require a metal ion cofactor are termed metal-activated enzymes to distinguish them from the metalloenzymes for which bound metal ions serve as prosthetic groups.
Reference-Satyanarayana Pg- 405