THEME AND FOCUS: METABOLISM OF CARBOHYDRATES Case Study: A 3 year old boy was brought to the emergency depament after several episodes of vomiting and lethargy. He was also found to have hypoglycemia. His pediatrician was concerned about possible hepatic failure along with recurrent episodes of vomiting and lethargy. After a careful history, it was observed that these episodes occur after ingestion of sweets or fruits. Lead Question: What is the most likely diagnosis?