Which ailment is a type of decompression sickness that involves the formation of bubbles in the body due to pressure reduction?

The correct choice is the type of decompression sickness associated with the formation of bubbles in the body as a result of a reduction in pressure. This phenomenon occurs when a diver ascends too quickly or spends too much time at depths where the water pressure causes gases to dissolve in the body, primarily nitrogen.

As the pressure decreases, these gases can come out of solution and form bubbles, which can lead to various symptoms affecting multiple areas of the body, including joints, tissues, and even the nervous system. This is a fundamental aspect of understanding decompression sickness and is critical for ensuring the safety of personnel engaged in activities such as diving or altitude flights.

Other options refer to different conditions. Barotrauma involves damage to body tissues caused by pressure changes but does not specifically refer to bubble formation. Altitude sickness is related to the inability to acclimatize to high altitudes, experiencing symptoms due to lower oxygen levels rather than decompression. Nitrogen narcosis occurs under high pressure conditions and is a different type of physiological effect, more related to the narcotic effects of nitrogen rather than bubble formation. Thus, the correct answer emphasizes the specific mechanics of decompression sickness and the role of gas bubbles in this condition.