What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)", specifically "financial institution". Your task is to determine what subcategory of business best describes this litigant.

Opinion:
COLUMBIA AUTO LOAN, Inc., trading as Columbia Credit Company, a body corporate, by and through its President, Samson Dewey Gottlieb, Appellant v. DISTRICT OF COLUMBIA, Appellee.
No. 10971.
United States Court of Appeals District of Columbia Circuit.
Argued Oct. 19, 1951.
Decided Nov. 8, 1951.
Writ of Certiorari Denied March 3,1952.
See 72 S.Ct. 553.
Samuel F. Beach, Washington, D. C., with whom Leslie C. Garnett and Bernard Margolius, Washington, D. C., were on the brief, for appellant.
Chester H. Gray, Principal Asst. Corporation Counsel for the District of CoJumbia, Washington, D. C., with whom Vernon E. West, Corporation Counsel, Milton D. Korman, Asst. Corporation Counsel, and Clark F. King, Asst. Corporation Counsel, all of Washington, D. C., were on the brief, for appellee.
Before EDGERTON, WILBUR K. MILLER, and WASHINGTON, Circuit Judges.
PER CURIAM.
The judgment is affirmed on the opinion of Judge Qagett. Mun.Ct.App.D.C., 78 A.2d 857.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)", specifically "financial institution". What subcategory of business best describes this litigant?

Choices:
bank
insurance
savings and loan
credit union
other pension fund
other financial institution or investment company
unclear

Answer: 5