## **Core Concept**
The symptoms described for the boy, such as vomiting, bloated abdomen, abdominal pain, and a history of similar episodes following the ingestion of milk and milk products, point towards a condition related to the inability to digest lactose, a sugar found in milk and other dairy products. This condition is known as lactose intolerance.

## **Why the Correct Answer is Right**
Lactose intolerance occurs due to the deficiency of **lactase**, an enzyme produced in the small intestine that breaks down lactose into glucose and galactose for absorption. Without sufficient lactase, lactose remains undigested and is fermented by bacteria in the colon, leading to gas production, bloating, abdominal pain, and diarrhea or vomiting. The symptoms match the boy's complaints, and the history of lactose intolerance being triggered by milk and ice cream (which contains lactose) supports this diagnosis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include conditions like celiac disease, irritable bowel syndrome (IBS), or other causes of gastrointestinal distress that are not directly related to lactose digestion.
- **Option B:** Similarly, without the specific text, we can infer that any condition not directly linked to lactose metabolism or similar symptoms would be incorrect.
- **Option C:** Again, without specifics, any option not directly implicating lactase deficiency or lactose intolerance would not fit the scenario described.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that lactose intolerance is common in individuals of certain ethnic backgrounds and can be managed with a lactose-restricted diet or lactase enzyme supplements. A classic presentation, as in this case, can help diagnose lactose intolerance, though confirmatory tests like the hydrogen breath test may be used.

## **Correct Answer:** C. Lactose intolerance.