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: Pathology
[{'content': 'Deficiency of enzyme hexosaminidase, n subunit causes - \nSelect and explain. \nA. Tay-Sachs disease, B. Hurler syndrome, C. Fabry disease, D. Pompe disease', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Tay- Sach's disease", 'role': 'assistant'}]