Dec 6 (Reuters) - Kroger Co KR.N said on Tuesday it received a request for additional information from the U.S. Federal Trade Commission as part of the regulatory review process for its planned $25 billion merger with Albertsons Companies Inc ACI.N. The deal, which was announced in mid-October, has drawn fire from lawmakers and consumer groups amid concerns the tie-up of the No. 1 and 2 standalone grocers in the United States could boost already-high food prices and stifle competition.