<prompt> A 6-year-old girl comes to her pediatrician with constipation, abdominal distention, and vomiting. After thorough examination, she is diagnosed as having Hirschsprung disease aganglionic megacolon, which is a congenital disease and leads to dilation of the colon. This condition is caused by an absence of which of the following kinds of neural cell bodies?Sympathetic preganglionic neuron cell bodiesSympathetic postganglionic neuron cell bodiesParasympathetic preganglionic neuron cell bodiesParasympathetic postganglionic neuron cell bodies  <response>: Aganglionic megacolon Hirschsprung disease is caused by the absence of enteric ganglia parasympathetic postganglionic neuron cell bodies in the lower pa of the colon, which leads to dilatation of the colon proximal to the inactive segment, resulting in an inability to evacuate the bowels. The other neuron cell bodies listed are not involved in this condition. 