A biological safety cabinet would be the best choice for preparing a parenteral formulation of:

A biological safety cabinet, also known as a biosafety cabinet, is a specialized laboratory equipment used for handling hazardous materials, including chemical and biological substances. Of the four options provided, only doxorubicin is considered a hazardous material due to its toxicity and potential for mutagenicity. Alteplase, nitroglycerin, and penicillin are not classified as hazardous materials and can be prepared without the need for a biological safety cabinet.