This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Specific Cytogenetic Disorders, Subject name: Pathology
Maternal disomy of chromosome 15 is seen in which of the following? 
Select and explain. 
A. Prader-Willi syndrome, B. Klinefelter syndrome, C. Angelman syndrome, D. Turner syndrome
A: Prader-Willi syndrome
Answer: A: Prader-Willi syndrome 
Explanation: Prader Willi syndrome could be present because of the following: Deletion of paternal chromosome 15. Uniparental disomy of maternal chromosome 15. SNORP mutation