Read following statements (a-d) and choose the option with only correct statements.
a. Parturition occurs due to a complex neuroendocrine mechanism at the end of gestation period.
b. The signals for parturition originate from fully developed foetus and placenta which induces mild uterine contraction.
c. Foetal ejection reflex triggers release of oxytocin from foetal pituitary.
d. Oxytocin reduces uterine contraction under positive feedback control and causes expulsion of placenta followed by foetus known as parturition.
a and b
b and c
c and d
a and d