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Question #45535
The Question
A mother relying on the Lactational Amenorrhea Method (LAM) abruptly ceases breastfeeding her 4-month-old infant. Three weeks later, she experiences a menstrual bleed. However, clinical evaluation reveals that no ovum was released prior to this bleed. Which of the following endocrine dynamics best explains this phenomenon?
Options
- A.
The sudden withdrawal of oxytocin prevents the rupture of the Graafian follicle despite normal LH levels.
- B.
The rapid decline in prolactin restores pulsatile GnRH, but the lag in Hypothalamic-Pituitary-Ovarian (HPO) axis synchronization results in an anovulatory cycle.
- C.
Residual high levels of prolactin directly inhibit the estrogen-induced LH surge, causing the endometrium to shed without ovulation.
- D.
The abrupt cessation of lactation causes a surge in progesterone from the adrenal cortex, which mimics the luteal phase and induces withdrawal bleeding.
Check Your Answer
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
Drug Withdrawal Syndrome|Lactational Amenorrhea Logic|Hypothalamic-Pituitary Axis Integration
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often harbor the misconception that any menstrual bleeding strictly indicates a preceding ovulation.
This question tests the distinction between an estrogen-breakthrough/withdrawal bleed and a true ovulatory menstrual cycle.
It also requires the student to correctly identify Prolactin (not Oxytocin) as the primary GnRH inhibitor during lactation, and understand the 'lag phase' required for the HPO axis to re-establish the precise hormonal feedback loops necessary for the LH surge.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Reproductive Health - Class 12 |
| Concept | Lactational Amenorrhea Logic |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |