This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pharmacology
[{'content': 'True regarding galactosemia NOT RELATED-MEDICINE \nSelect and explain. \nA. There is an incidence of 1 in 6000, B. The enzyme deficiency is glucose phosphorylase, C. There is an inability to metabolize galactose and lactose, D. Diagnosis is by WBC enzyme assay', 'role': 'user'}, {'content': 'Answer: C \nExplanation: .', 'role': 'assistant'}]