Extrapyramidal reactions can be treated by:

Correct Answer: B

Rationale: The correct answer is B: Benztropine mesylate. Benztropine is an anticholinergic medication that helps alleviate extrapyramidal reactions by blocking excess acetylcholine activity in the brain. Levodopa (A) is used to treat Parkinson's disease but can worsen extrapyramidal reactions. Bromocriptine (C) is a dopamine agonist used in Parkinson's disease, not for treating extrapyramidal reactions directly. Dopamine (D) itself is not used to treat extrapyramidal reactions as it does not directly address the underlying mechanism of the condition.

Correct Answer: A

Rationale: The correct answer is A: Antipsychotic. Piracetam is a nootropic drug known for its cognitive-enhancing properties, not for its antipsychotic effects. Piracetam is commonly used for improving memory, learning, and concentration. Anticonvulsant (B), Psychometabolic (C), and Antihypoxic (D) effects are well-documented with Piracetam use. Antipsychotic effects are not a recognized pharmacological action of Piracetam.

Correct Answer: A

Rationale: The correct answer is A: "ecstasy" (methylenedioxymethamphetamine). Ecstasy is related to psychedelics due to its hallucinogenic effects, altering sensory perception and mood. It acts on serotonin receptors, similar to classic psychedelics like LSD. Incorrect choices: B: Cocaine - Cocaine is a stimulant but not related to psychedelics. It primarily affects dopamine levels in the brain. C: "crack" (cocaine free base) - Crack is a form of cocaine, also primarily impacting dopamine levels. D: Caffeine - Caffeine is a stimulant that primarily affects adenosine receptors, not related to psychedelics.

Correct Answer: D

Rationale: Correct Answer: D Rationale: 1. Methylxanthines (e.g., theophylline) help relax bronchial smooth muscles. 2. M-cholinoblocking agents (e.g., ipratropium) block the action of acetylcholine, reducing bronchoconstriction. 3. Beta2-stimulants (e.g., albuterol) relax bronchial smooth muscles and dilate airways. 4. "All of above" encompasses all three drug groups, covering various mechanisms to manage asthma symptoms effectively.

Correct Answer: B

Rationale: Erythropoietin does not influence leucopoiesis because it specifically stimulates the production of red blood cells (erythropoiesis). Filgrastim (A) increases white blood cell production, Doxorubicin (C) suppresses bone marrow function impacting white blood cell production, and Methotrexate (D) inhibits cell proliferation including white blood cells. Therefore, B is the correct answer as it does not affect leucopoiesis.