Which Is the Correct Translation and Definition of the Abbreviation

Which is the correct translation and definition of the abbreviation V/Q?

A) Hyperventilation, over breathing; condition of having too much air flowing into and out of the lungs
B) Nebulizer, a machine that administers respiratory medication by creating a "cloud" or mist that is inhaled by the patient
C) Ventilation quotient, a test of a patient's airflow
D) Ventilation-perfusion scan, a scan that tests whether a problem in the lungs is caused by airflow or blood flow
E) Whispered pectoriloquy, used as a means of finding masses in the lung