question: Q:A 3-year-old is brought to the pediatrician by his mother because she is concerned about recent changes to his behavior. She states that he has seemed to regress in his motor development and has been having occasional brief episodes of uncontrollable shaking. During the subsequent work up, a muscle biopsy is obtained which demonstrates red ragged fibers and a presumptive diagnosis of a genetic disease made. The mother asks if her other son will be affected. What should be the physician's response?? 
  {'A': 'There is a 100% he will be affected, but the severity may be different', 'B': 'There is a 25% chance he will be affected', 'C': 'He will be unaffected', 'D': 'There is a 100% he will be affected, and the severity will be the same', 'E': 'There is a 50% chance he will be affected'},