This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mutations & Codons, Subject name: Biochemistry
Defect in which of the following protein leads to Rett syndrome? 
Select and explain. 
A. Histone acetyl transferase, B. Methyl cytosine binding protein, C. Ten eleven translocase, D. DNA methylase
B: Methyl cytosine binding protein
Answer: B: Methyl cytosine binding protein 
Explanation: Rett syndrome : a.k.a. , Cerebro-atrophic hyperammonemias X-linked dominant disorder. Defective protein - methyl CpG binding protein . Methyl cytosine binding proteins are epigenetic code reader.