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
The most common enzyme deficiency in man is ? 
Select and explain. 
A. Glucose-6-phosphate dehydrogenase, B. Glucose-6-phosphatase, C. Hexokinase, D. Glucose-1.6-diphosphatse
A: Glucose-6-phosphate dehydrogenase
Answer: A: Glucose-6-phosphate dehydrogenase 
Explanation: A i.e. Glucose-6- PO4 dehydrogenaseGlucose 6 phosphate dehydrogenase deficiency is most common and pyruvate kinase deficiency is 2.d most common cause of enzyme deficiency related hemolytic anemiaQ.