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a
only progestogen.
b
only estrogen.
c
both estrogen and progestogen.
d
centchroman.
answer is D.
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Detailed Solution
Saheli is a non steroidal pill composed of centachroman. Saheli works as a modulator of the selective estrogen receptor. This avoids the hormone's action on the uterus and inhibits implantation of the eggs. It is developed by the scientists of CDRI, Lucknow.