A nurse is caring for an infant who has inadequate motility of part of the intestine resulting in a mechanical obstruction. The nurse should identify this finding as a manifestation of which of the following disorders?

A. Bone marrow transplantation.

Severe aplastic anemia is a condition characterized by a significant reduction in the number of blood cells produced by the bone marrow. The primary treatment for severe aplastic anemia is a bone marrow transplantation, also known as a stem cell transplant. This procedure involves replacing the patient's dysfunctional bone marrow with healthy bone marrow or stem cells from a suitable donor. This is done to restore normal blood cell production.

Option B (Exchange transfusion) is not the primary treatment for severe aplastic anemia but may be used in certain cases to manage complications or specific symptoms.

Option C (Liver transplantation) is not a treatment for severe aplastic anemia, as this condition primarily affects the bone marrow and blood cell production.

Option D (Administration of intravenous immunoglobulin) is not the primary treatment for severe aplastic anemia but may be used in some cases to manage complications, such as infections. However, it does not address the underlying cause of the disease, which is the failure of the bone marrow to produce enough blood cells.

A.Pyloric stenosis is a condition where there's narrowing of the opening between the stomach and the small intestine. It is not related to inadequate motility of the intestine.

B.Enterocolitis refers to inflammation of the small intestine and colon. While this can cause obstruction in some cases, it's not the primary cause of inadequate motility as seen in the question.

C.Encopresis is the voluntary or involuntary passage of feces outside the toilet in children who should be toilet trained. It is not a cause of mechanical intestinal obstruction.

D. Hirschsprung's disease is a congenital disorder where there is inadequate motility in part of the intestine, leading to mechanical obstruction. It usually affects the colon and is due to the absence of ganglion cells in the affected segment of the bowel.

So, Hirschsprung's disease is the specific condition that leads to inadequate motility and mechanical obstruction of part of the intestine in infants.