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
In urea cycle which defect is an X linkeddisease ? 
Select and explain. 
A. Ornithine transcarbamylase, B. Aspaate transcarbamylase, C. Arginase, D. Argininosuccinate synthase
A: Ornithine transcarbamylase
Answer: A: Ornithine transcarbamylase 
Explanation: Ans. is 'a' i.e., Ornithine transcarbamylase