Correct option is B
Ans. (b)
Sol. The second stage of labour is identified when the cervix is fully dilated, and the woman is ready to push the baby out.
Explanation of each option:
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(a) Membranes have ruptured – Incorrect. While the rupture of membranes may occur before or during labour, it does not specifically indicate the second stage.
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(b) Cervix is dilated completely – Correct. Complete dilation (10 cm) marks the start of the second stage of labour, which involves the expulsion of the baby.
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(c) Begins to expel clear vaginal fluid – Incorrect. Expulsion of fluid can occur at various stages, particularly during the first stage, but it doesn't mark the second stage.
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(d) Contractions are regular – Incorrect. Regular contractions are a feature of all stages of labour but do not specifically signify the second stage.