Multiple choice Which of the following is a pair of synthetic estrogens? Estrone and Estriol Diethylstilbestrol and Fosfestrol Estriol and Fosfestrol Chlorotrianisene and Estrone Estrone and Fosfestrol Reveal answer Fill a bubble to check yourself B Correct answer Explanation Correct answer. Diethylstilbestrol is a synthetic nonsteroidal estrogen that was first synthesised in 1938. Fosfestrol is a synthetic estrogen used as an antineoplastic agent.