<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 2720-g 6-lb female newborn delivered at 35 weeks gestation starts vomiting and becomes inconsolable 48 hours after birth. The newborn has not passed her first stool yet. Examination shows abdominal distention and high-pitched bowel sounds. A water-soluble contrast enema study shows microcolon. Serum studies show increased levels of immunoreactive trypsinogen. Which of the following is the most likely additional laboratory finding?? A: Decreased hydrogen ion concentration in renal collecting duct, B: Increased chloride concentration in alveolar fluid, C: Increased serum calcium concentration, D: Increased bicarbonate concentration in pancreatic secretions, E: Increased sodium concentration in sweat,  <response>: This is a medical question asking about the most likely additional laboratory finding in a newborn with symptoms of abdominal distention, lack of stool, and microcolon on enema, along with increased immunoreactive trypsinogen. This clinical picture is most consistent with cystic fibrosis. In cystic fibrosis, there is impaired chloride transport in epithelial cells lining the lungs, pancreas, intestines, and other organs. This results in thick mucus secretions. The increased immunoreactive trypsinogen also points towards pancreatic involvement. The most likely additional laboratory finding would be increased sodium and chloride concentration in the sweat, which is a classic finding in cystic fibrosis due to impaired reabsorption of sodium and chloride in sweat gland ducts.E: Increased sodium concentration in sweat 