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Question #46359
The Question
A neonate presents with severe anemia and jaundice shortly after birth. The attending physician must differentiate whether the etiology is Erythroblastosis fetalis or a vertically transmitted congenital STI (such as Syphilis). Which of the following statements correctly highlights the fundamental pathophysiological difference between these two conditions?
Options
- A.
Erythroblastosis fetalis is initiated by the active invasion of maternal cytotoxic T-cells into the fetal circulation, whereas congenital STIs rely on the passive transfer of microbial toxins.
- B.
In Erythroblastosis fetalis, fetal RBCs are destroyed by maternal IgM antibodies that cross the placenta, whereas congenital STIs are caused by pathogens that are strictly blocked by the placental barrier.
- C.
Erythroblastosis fetalis results from the passive transplacental transfer of maternal antibodies causing targeted hemolysis, whereas congenital STIs involve active pathogen proliferation and systemic inflammatory damage.
- D.
Erythroblastosis fetalis triggers an immediate active immune response in the fetus against maternal antigens, whereas congenital STIs primarily suppress the fetal cell-mediated immunity.
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Comparative_Analysis
Sharpen your ability to evaluate multiple scenarios and distinguish between competing potential answers.
Concepts Behind This Question
ABO-Rh Incompatibility Logic|STI vs STD Distinction|IgG_Transfer
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Distinguishing between the passive transfer of harmful maternal immunity (IgG antibodies) and the active vertical transmission of infectious agents (pathogens).
A common misconception is confusing the antibody class that crosses the placenta (IgG vs IgM) or misattributing the hemolytic damage in Erythroblastosis fetalis to a cell-mediated (T-cell) or active fetal immune response rather than a passive maternal humoral response.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Body Fluids and Circulation - Class 11 |
| Concept | ABO-Rh Incompatibility Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |