How does cholera toxin exert its effect in the small intestine?

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By ADP-ribosylating the G regulatory proteinBy blocking the activity of adenyl cyclaseBy stimulating GTPase activityBy promoting active sodium chloride absorption

Explanation

Cholera toxin causes disease by ADP-ribosylation of the G regulatory protein, which leads to persistent activation of adenyl cyclase. This disrupts ion transport in the small intestine, resulting in excessive fluid loss. The other options are incorrect mechanisms of action.