This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'The abdominal mass in pyloric stenosis in a new born child can be best palpated: \nSelect and explain. \nA. During feeding, B. In the umbilical area, C. In the epigastric area, D. In the right hypochondriac quadrant', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref. Sabiston Textbook of Surgery. Pg. 1869\n\xa0\nBackground\n\nHypertrophy of the pyloric sphincter causes narrowing of the gastric outlet\nMost common cause of gastric obstruction in patients 2-12 weeks old\nRisk factors include male (4:1); firstborn (2:1); white/caucasian; term infants; bottle-fed babies\n\nPresentation\n\nUsually present around 3-6 weeks with a history of progressively worsening non-billious vomiting (may be projectile)\nAssociated with poor weight gain, decreased urine output (fewer wet nappies) and stools, excessive hunger, dry mucous membranes and depressed fontanelle\nExamination of the abdomen may reveal an epigastric ‘olive-shaped’ mass\n\nManagement\n\nFluid resuscitation- correct any electrolyte disturbance (particularly hypokalaemia) prior to surgery\nNil by mouth and nasogastric drainage or suction\xa0prior to surgery and between feeds\nSurgery – Pyloromyotomy', 'role': 'assistant'}]