Hyperprolactinemia is caused by blockade of dopamine in:

Correct Answer: B

Rationale: The correct answer is B: The pituitary. Dopamine inhibits prolactin release from the pituitary gland. Blockade of dopamine receptors in the pituitary leads to increased prolactin levels, causing hyperprolactinemia. Choices A, C, and D are incorrect as they are not directly involved in regulating prolactin release. A is related to nausea and vomiting control, C is associated with motor functions, and D is involved in reward and motivation pathways.

Correct Answer: B

Rationale: The correct answer is B because nootropics do not stimulate the bulbar respiratory center. Nootropics are substances that enhance cognitive function and brain health. Choice A is correct as nootropics are known to improve cognitive functions. Choice C is also correct as they enhance neuronal synapses. Choice D is incorrect as nootropics are not designed to protect against damaging influences but rather to enhance brain function. Therefore, choice B is the correct answer because nootropics do not have a direct effect on the bulbar respiratory center.

Correct Answer: C

Rationale: The correct answer is C: Cocaine. Crack cocaine is a highly addictive stimulant drug derived from cocaine. The process of making crack involves mixing cocaine with baking soda and water, then heating it to form small rocks or crystals. Crack is different from cocaine in that it is smoked rather than snorted, leading to a quicker and more intense high. Crack is not derived from opium (A), LSD (B), or cannabis (D). Opium is a narcotic derived from the opium poppy plant, LSD is a hallucinogenic drug, and cannabis is a plant that produces marijuana. Therefore, the correct answer is C as crack is a derivative of cocaine specifically.

Correct Answer: B

Rationale: The correct answer is B: Desoxiribonuclease. Desoxiribonuclease is a proteolytic enzyme that breaks down DNA molecules. Proteolytic enzymes are enzymes that break down proteins into smaller peptides or amino acids. Potassium iodide, Carbocysteine, and Acetylcysteine are not proteolytic enzymes, they are used for different purposes such as treating respiratory conditions or as expectorants. Therefore, B is the correct answer as it is the only option that is a proteolytic enzyme.

Correct Answer: C

Rationale: The correct answer is C: Methotrexate. Methotrexate is a chemotherapy drug that inhibits cell division, including erythroid precursors, thereby suppressing erythrogenesis. Iron dextran, vitamin B12, and folic acid are essential for erythrogenesis by supporting hemoglobin synthesis and red blood cell production. Iron dextran provides iron for hemoglobin synthesis, vitamin B12 is required for DNA synthesis in erythroid precursors, and folic acid is essential for DNA synthesis and cell division. Therefore, methotrexate is the only drug among the choices that does not stimulate erythrogenesis.