This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Integrated QBank, Subject name: Anatomy
[{'content': 'A 10-year-old child with sho stature presented to the pediatric OPD with external ophthalmoplegia, gait abnormality, sensorineural hearing loss. Lab findings revealed raised fasting blood glucose levels. ECG Fundus examination Which of the following is true about the DNA involved in the above disease: - \nSelect and explain. \nA. Circular, B. Double-helix, C. Bounded by nuclear envelope, D. Packed into chromatin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: This is a case of Kearns-Sayre syndrome. Multi-organ disorder External ophthalmoplegia Hea block Retinitis pigmentosa Dementia, SNHL and multiple endocrine abnormalities Mitochondrial inheritance Mitochondrial DNA Circular Has several copies of single mtDNA molecule Free of nuclear envelope Not packed into chromatin Encodes for 13 genes', 'role': 'assistant'}]