Which of the following neurotransmitters has been most consistently implicated in the patient's disorder?

Correct Answer: A

Rationale: Acetylcholine has been consistently implicated in Alzheimer's disease, which is the disorder the 71-year-old man was diagnosed with. This neurotransmitter is involved in memory and cognitive function, both of which are affected in Alzheimer's disease. A drug that acts on the central cholinergic system would likely target acetylcholine to improve symptoms in this patient. The other neurotransmitters listed are not as strongly linked to Alzheimer's disease.

Correct Answer: B

Rationale: Bicuculline is a competitive antagonist of GABA-A receptors, blocking inhibitory neurotransmission and potentially inducing seizures.

Correct Answer: D

Rationale: The patient's signs and symptoms, such as mydriasis, tonic-clonic seizure, shallow respiration, and cardiovascular collapse leading to death, are consistent with LSD intoxication. LSD is known to cause agitation, altered mental status, and severe physiological effects, making it the most likely cause of the patient's death.

Correct Answer: C

Rationale: NMDA receptors are crucial for synaptic plasticity and long-term potentiation.

Correct Answer: C

Rationale: Bupropion is a medication that is commonly used to treat depression, ADHD, and smoking cessation. Given the woman's symptoms of feeling fearful, helpless, and worried, as well as her difficulty organizing thoughts and smoking habit, bupropion would be a suitable choice as it can address both depressive and attention deficit disorders, as well as aid in smoking cessation.