<prompt> What is the primary toxicity of doxorubicin Adriamycin?CardiomyopathyPulmonary fibrosisPeripheral neuropathyUric acid nephropathy  <response>: Doxorubicin, an antibiotic derived from Streptomyces species, has activity against sarcomas and carcinomas of the breast, liver, bladder, prostate, head and neck, esophagus, and lung. Its major side effect is production of a dilated cardiomyopathy. Patients receiving this agent should have echocardiography before and after treatment in order to monitor potential cardiac toxicity. 