**Core Concept**
Celiac sprue, also known as celiac disease, is a chronic autoimmune disorder characterized by an adverse reaction to gluten, leading to small intestine mucosal damage and malabsorption of nutrients. The pathogenesis involves a complex interplay between genetic predisposition, environmental factors, and immune system dysregulation.

**Why the Correct Answer is Right**
The association of celiac sprue with **HLA-DQ2 and HLA-DQ8 haplotypes** is well-established. These HLA class II alleles are responsible for presenting gluten-derived peptides to T-cells, triggering an immune response and subsequent mucosal damage. The presence of these haplotypes increases the risk of developing celiac disease, especially in genetically susceptible individuals. The involvement of the immune system and specific genetic markers highlights the autoimmune nature of this condition.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because celiac sprue is not primarily associated with an imbalance of gut flora or altered gut motility.
**Option B:** This option is incorrect because while celiac sprue can lead to malabsorption of various nutrients, it is not primarily linked to an overgrowth of bacteria in the small intestine.
**Option C:** This option is incorrect because celiac sprue is not primarily a result of a deficiency in lactase enzyme or a problem with lactose digestion.

**Clinical Pearl / High-Yield Fact**
Celiac sprue is often underdiagnosed, and patients may present with non-specific symptoms such as diarrhea, abdominal pain, and weight loss. A high index of suspicion and prompt testing for HLA-DQ2 and HLA-DQ8 haplotypes can aid in early diagnosis and initiation of a strict gluten-free diet.

**Correct Answer: D. HLA-DQ2 and HLA-DQ8 haplotypes.**