**Core Concept**
Infantile constipation can be caused by various organic factors, including anatomical, physiological, and pathological conditions that affect bowel movements. These factors can lead to delayed or infrequent passage of stool, causing discomfort and potential complications.

**Why the Correct Answer is Right**
The correct answer is a list of organic causes of constipation in infants. These include Hirschsprung's disease, intestinal obstruction, and hypothyroidism. Hirschsprung's disease is a congenital condition characterized by the absence of ganglion cells in the distal colon, leading to functional obstruction. Intestinal obstruction can be caused by conditions such as volvulus, intussusception, or hernias, which can physically block the passage of stool. Hypothyroidism can cause decreased gut motility, leading to constipation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is blank. Please provide the options.

**Option B:** This option is also blank. Please provide the options.

**Option C:** This option is blank. Please provide the options.

**Option D:** This option is blank. Please provide the options.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that constipation in infants can be a sign of an underlying organic cause, and a thorough evaluation is necessary to rule out conditions such as Hirschsprung's disease, intestinal obstruction, or hypothyroidism.

**Correct Answer:**
(D).