A nurse is caring for a client who is prescribed heparin via intravenous (IV). 40 minutes after the administration of heparin, the client reports "coughing up blood" and notes there is blood in his stool.Based on the client's presenting symptoms, which of the following options is an antidote for this client?

Choice A rationaleBenztropine is an anticholinergic agent used to treat Parkinsonism and extrapyramidal symptoms, not suitable for reversing heparin effects.Choice B rationaleProtamine sulfate is the specific antidote for heparin overdose. It works by neutralizing the anticoagulant effects of heparin.Choice C rationaleVitamin K is an antidote for warfarin overdose, promoting the synthesis of clotting factors, but ineffective against heparin.Choice D rationaleDigibind is an antidote for digoxin toxicity, not appropriate for counteracting heparin.