In human physiology, which of the following best describes the gag reflex?
A) The gag reflex is a voluntary response that helps with the ingestion of food and liquids by stimulating salivation.
B) The gag reflex is an involuntary protective mechanism triggered by the stimulation of the soft palate or back of the throat, which helps prevent choking by expelling foreign objects from the throat.
C) The gag reflex is a condition where the body involuntarily expels food from the stomach through the esophagus.
D) The gag reflex is a response that regulates heart rate and blood pressure during stressful situations.