Tick narcotic analgesic which is a phenylpiperidine derivative:

Correct Answer: C

Rationale: The correct answer is C: Fentanyl. Fentanyl is a phenylpiperidine derivative due to its specific chemical structure containing a piperidine ring attached to a phenyl group. Codeine (A) is an opioid, but not a phenylpiperidine derivative. Dezocine (B) is a benzomorphan derivative. Buprenorphine (D) is a thebaine derivative. Fentanyl stands out as the only option that fits the phenylpiperidine derivative category.

Correct Answer: D

Rationale: The correct answer is D. Lithium treatment is associated with various adverse effects. Cardiovascular anomalies in the newborn can occur if lithium is taken during pregnancy. Thyroid enlargement is a common side effect of lithium, as it interferes with thyroid hormone synthesis. Nephrogenic diabetes insipidus is another well-known adverse effect of lithium, leading to excessive urination and thirst. Choosing option D is correct as it encompasses all the mentioned adverse effects associated with lithium treatment. Other choices are incorrect as they do not cover the full spectrum of adverse effects linked to lithium.

Correct Answer: D

Rationale: Step-by-step rationale: 1. Amphetamine acts as a direct catecholaminergic agonist, stimulating the release of norepinephrine and dopamine (A). 2. It also inhibits monoamine oxidase, preventing the breakdown of these neurotransmitters (B). 3. Additionally, amphetamine increases the release of catecholaminergic neurotransmitters by reversing their transporters (C). 4. Therefore, the correct answer is D, as amphetamine's mechanism involves all of the actions mentioned in choices A, B, and C.

Correct Answer: D

Rationale: Step-by-step rationale: 1. Flumazenil is a benzodiazepine antagonist used to reverse CNS depressant effects of benzodiazepine overdose. 2. It can hasten recovery following use of benzodiazepines in anesthetic and diagnostic procedures. 3. It can also reverse benzodiazepine-induced respiratory depression. 4. Therefore, the correct answer is D as it encompasses all the uses of flumazenil. Other choices are incorrect as they do not cover all the indicated uses.

Correct Answer: C

Rationale: The correct answer is C: Nitrous oxide. Nitrous oxide inhibits methionine synthase activity by inactivating vitamin B12, leading to megaloblastic anemia. Desflurane, Halothane, and Sevoflurane do not affect methionine synthase or cause megaloblastic anemia. Nitrous oxide is the only anesthetic among the choices known for this specific mechanism of action.