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B
John Rock
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C
Both of them
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D
None of them
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Solution
The correct option is C Both of them
Endocrinologist Pincus tested progesterone in rats and found out that it worked. He and gynaecologist John Rock, who has already begun testing chemical contraception in women,collaborated there research and finally in
1954, Rock and Pincus successfully conduct the first human trials on 50 women in Massachusetts.