Assertion: Continued exposure to the same stressor or additional stressors drains the body of its resources and leads to the third stage of exhaustion in the General Adaptation Syndrome (GAS).

Reasoning: The presence of a noxious stimulus or stressor leads to activation of the adrenal-pituitary-cortex system in the resistance stage in General Adaptation Syndrome (GAS).

The assertion is true, but the reasoning is false.

The presence of a noxious stimulus or stressor leads to activation of the adrenalpituitary-cortex system in the Alarm reaction stage of GAS. Hence Reasoning is incorrect.

The exhaustion stage is reached when an individual is subjected to prolonged or repeated exposure to the same stressor or multiple stressors, depleting the body's resources and energy reserves. This stage is the third and final phase in the general adaptation syndrome model proposed by Hans Selye. During this stage, the body's ability to cope with stress becomes significantly diminished.