Which of the following diagnostic procedures is a test for malignant cells?

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Sputum cytology is a diagnostic procedure in which a sample of mucous coughed up from the lungs is examined under a microscope for the presence of cancer cells. This test is used to diagnose lung cancer and determine the type of cancer present. Sputum culture and sensitivity, pulmonary function test, and arterial blood gas are not tests for the presence of malignant cells.

Which of the Following Diagnostic Procedures Is a Test for Malignant