## **Core Concept**
The question describes a pediatric patient with symptoms suggestive of intestinal obstruction, including abdominal distension, fever, bilious vomiting, and constipation. The history of recurrent severe abdominal pain, tenesmus (a feeling of incomplete evacuation), and blood in stools points towards a chronic condition affecting the intestines. The need for intestinal resection during exploratory laparotomy implies a significant pathological process.

## **Why the Correct Answer is Right**
The symptoms and findings suggest a condition that causes chronic inflammation and possibly obstruction of the intestine. The presence of blood in stools and tenesmus indicates involvement of the rectum or lower parts of the intestine. The correct answer, **C.**, implies a diagnosis of **Hirschsprung's disease**. This condition is characterized by the absence of ganglion cells in the distal bowel, leading to a functional obstruction. It presents with constipation, abdominal distension, and can lead to enterocolitis, which might explain the fever and bilious vomiting due to secondary complications.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option might represent another gastrointestinal condition, but without specifics, it's hard to directly refute. However, conditions like intestinal atresia or malrotation might not fully explain the chronic symptoms and the specific need for resection due to gangrene or necrosis.
- **Option B:** This could potentially represent another condition affecting the intestines, such as a tumor or a different type of obstruction. However, the chronic nature and specific symptoms point more towards a congenital or developmental issue like Hirschsprung's disease.
- **Option D:** This option might suggest a different pathology, such as an infectious or inflammatory condition. However, the surgical intervention and the chronic history make a condition like Hirschsprung's more likely.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl in this case is that **Hirschsprung's disease** often presents with a history of constipation since birth, and it can lead to severe complications like enterocolitis, which seems to be the case here given the symptoms of fever and abdominal distension. A diagnostic clue is the absence of ganglion cells in the affected segment of the intestine, which is confirmed histologically.

## **Correct Answer:** C. Hirschsprung's disease.