Gịnị bụ aha kwesịrị ekwesị nke ọgwụ steroid nke onye Britain ahụ lara ezumike nká na-agba ọsọ n'ebe a na-eme egwuregwu bụ́ onye so ná ndị kasị agba ọsọ na Europe n'akụkọ ihe mere eme nke egwuregwu?
Tetrahydrogestrinone