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 "manufacturing". Your task is to determine what subcategory of business best describes this litigant.

Opinion:
CHAS. PFIZER & CO., Inc., v. ZENITH LABORATORIES, INC., and Continental Vitamins Corp. Continental Vitamins Corp., Appellant.
No. 15172.
United States Court of Appeals Third Circuit.
Argued Dec. 30, 1964.
Decided Dec. 31, 1964.
Abraham J. Nydick, New York City (Wilentz, Goldman & Spitzer, Perth. Amboy, on the brief), for appellant.
Arthur G. Connolly, Connolly, Bove &. Lodge, Wilmington, Del. (James R. E.. Ozias, McCarter & English, Newark, N.. J., Thomas S. Lodge, F. L. Peter Stone,. Wilmington, Del., on the brief), for ap-pellee.
Before BIGGS, Chief Judge, and FOR-MAN and SMITH, Circuit Judges.
PER CURIAM.
We have examined and re-examined the' record in this case and have weighed the arguments of the parties. It is clear that the court below did not err in its decree of December 16, 1964 (entered December 17, 1964), denying a motion by the defendant-appellant, Continental Vitamins Corp., to enjoin the plaintiff-appellee, Chas. Pfizer & Co., Inc., inter alia, from proceeding with the prosecution of a civil suit instituted by the plaintiff against Barry-Martin Pharmaceuticals, Inc., in the United States District Court for the Southern District of Florida, Miami Division, viz., Civil Action No. 64-175-Civ.-EC.
Consequently, the decree appealed from ■will be affirmed.

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

Choices:
auto
chemical
drug
food processing
oil refining
textile
electronic
alcohol or tobacco
other
unclear

Answer: 2