<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 3-year-old is brought to the pediatrician by by his mother. She is concerned that he appears fatigued all the time. She also mentions that he struggles to get out of his seat after eating his meals and when he waddles when he walks now. The child was born at 39 weeks via spontaneous vaginal delivery. He is up to date on all his vaccines and meeting all developmental goals. A maternal uncle with similar symptoms that started in early childhood. He has a heart rate of 90min, respiratory rate of 22min, blood pressure of 11065 mm Hg, and temperature of 37.0C 98.6F. The child appears lethargic. He was much more active during his previous well-child visit. Upon examination, the child has thick calves and uses his hands to support himself as he stands up from a sitting position. His reflexes are decreased bilaterally. Lab studies show elevated creatinine phosphokinase CPK and lactate dehydrogenase LDH. Which of the following is the most likely cause of this patients condition?? A: Missense mutation in β-thalassemia gene, B: Missense mutation in DMD gene, C: Nonsense mutation in DMD gene, D: Nonsense mutation in DMPK gene, E: Mutation in WT gene,  <response>: Based on the information provided in the question stem, the 3-year-old boy is exhibiting symptoms of fatigue, difficulty getting up from a seated position, waddling gait, thick calves, and decreased reflexes. He also has a family history of similar symptoms starting in childhood. Lab studies show elevated CPK and LDH. This clinical presentation is most consistent with a muscular dystrophy, likely Duchenne muscular dystrophy DMD. DMD is an X-linked recessive disorder caused by mutations in the DMD gene which codes for dystrophin. The elevated CPK and LDH indicate muscle breakdown. The other answer choices describe mutations unrelated to the patients presentation.C: Nonsense mutation in DMD gene 