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Question #46196
The Question
A nursing mother suffers from a rare condition that specifically degrades her Mucosa-Associated Lymphoid Tissue (MALT) in the gastrointestinal tract. Her pituitary gland and mammary alveolar cells remain structurally and functionally intact. Despite receiving normal volumes of breast milk, her exclusively breastfed infant suffers from recurrent enteric (intestinal) infections. Which of the following is the most scientifically accurate explanation for the infant's susceptibility?
Options
- A.
The degradation of MALT prevents the activation and homing of antigen-specific B-lymphocytes to the mammary glands, depriving the milk of secretory IgA.
- B.
The condition indirectly inhibits the release of oxytocin from the posterior pituitary, preventing the ejection of the antibody-rich fraction of the milk.
- C.
The lack of maternal MALT stops the transfer of pre-formed maternal T-lymphocytes, which are strictly required to establish the infant's active immunity.
- D.
The condition alters the differential permeability of the mammary ducts, causing transplacental IgG to replace IgA as the primary antibody in the breast milk.
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Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Regulatory_Failure
Understand how NOT, EXCEPT, and logical constraints are used to manipulate exam results.
Concepts Behind This Question
Mammalia Mammary Glands|MALT Structure|Human Health and Disease
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize 'Colostrum = IgA' without understanding the systemic origin of these antibodies.
The trap is assuming the mammary gland independently generates specific enteric antibodies.
The question tests the ability to distinguish between the quantitative hormonal control of lactation (Prolactin/Oxytocin) and the qualitative immunological composition dependent on peripheral lymphoid tissues (MALT).
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Animal Kingdom - Class 11 |
| Concept | Mammalia Mammary Glands |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |