Tick pirazolone derivative:

Correct Answer: B

Rationale: The correct answer is B: Analgin. Analgin is a pirazolone derivative, specifically metamizole. It is a non-opioid analgesic and antipyretic medication. Methylsalicylate is a salicylate derivative used as a topical pain reliever. Paracetamol is an analgesic and antipyretic drug but not a pirazolone derivative. Ketorolac is a nonsteroidal anti-inflammatory drug (NSAID) but not a pirazolone derivative. Therefore, Analgin is the only choice that fits the criteria of being a pirazolone derivative.

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.

Correct Answer: C

Rationale: Fepranone is the correct answer because it is a medication used to suppress appetite, not stimulate it. Vitamins are essential nutrients, bitters can stimulate appetite, and insulin regulates blood sugar but can also stimulate appetite. Therefore, Fepranone is the only drug in the list that does not stimulate appetite.