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: Pediatrics
An infant presents to OPD with signs of heart failure. On examination, there is hypotonia; hepatomegaly, cardiomegaly. ECG shows tall QRS complex and short PR interval. Which enzyme is deficient in this condition? 
Select and explain. 
A. Glucose 6 - phosphatase, B. Muscle phosphorylase, C. Liver phosphorylase, D. Acid maltase
D: Acid maltase
Answer: D: Acid maltase 
Explanation: Hypotonia, hepatomegaly, cardiomegalyare seen in Pompe disease.
Acid maltase or Alpha 1,4. Glucosidase is deficient in Pompe disease.