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1557 Gynaecology & Obstetrics

A 16-year-old female has not yet staed having menstrual cycles. Her secondary sex characteristics appear normal as does external examination of her genitalia. She is given an intramuscular injection of progesterone and 5 days later she has her first period. The mechanism responsible for the delay in menses is :-

AHypoestronism
BHypopituitarism
CAn end-organ abnormality
DA normal constitutional delay in menarche
Gynaecology & Obstetrics
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