Joan needs $$250$$ pounds of metal with $$27\textbackslash\%$$ silver. If Joan combines one metal with $$23\textbackslash\%$$ silver, and another with $$43\textbackslash\%$$ silver,how much of each metal does Joan need respectively? 
选项为:A:$$200$$;$$50$$  B:$$150$$;$$100$$  C:$$100$$;$$150$$  D:$$50$$;$$200$$  请回答其中一个选项.