What condition occurs when the pulp is irritated from decay or moisture with thermal stimuli?

Reversible pulpitis is the correct answer because it refers to a condition in which the dental pulp experiences inflammation due to irritants such as decay or excessive moisture. This condition often arises when the pulp is exposed to thermal stimuli, such as hot or cold temperatures, and the nerve endings in the pulp become sensitive. Despite the irritation, the pulp retains its vitality and can heal once the underlying cause, like the decay, is addressed.

In reversible pulpitis, symptoms may include sharp pain or discomfort in response to stimuli, but the pain typically subsides once the irritant is removed. This distinguishes it from irreversible pulpitis, where the pulp has reached a point of significant damage and inflammation that cannot be healed, leading to more severe pain and potential necrosis of the pulp. Other conditions like pulp necrosis indicate a more severe state where the pulp is dead, while pulpitis asystole is not a recognized term in dental literature and does not relate clearly to pulp conditions.