Yellen says currency intervention acceptable only in rare situations
(Adds quotes, context) WASHINGTON, April 25 (Reuters) - U.S. Treasury Secretary Janet Yellen said on Thursday the strong dollar reflected the strength of the U.S. economy and high interest rates, insisting that interventions by governments in currency markets were acceptable only in rare circumstances. Yellen, speaking in an interview with Reuters, acknowledged the strength of the dollar and divergences with other countries, but said the dollar's rise reflected "the strength of the U.S. economy and the level of interest rates." The former chair of the Federal Reserve declined to comment...