Currently used dopamine agonists decreasing pituitary prolactin secretion are following:

Correct Answer: D

Rationale: The correct answer is D because all three dopamine agonists, Bromocriptine, Cabergoline, and Pergolide, are known to decrease pituitary prolactin secretion. Dopamine inhibits prolactin release from the pituitary gland, and these agonists mimic dopamine's action. Therefore, all three choices are correct. Summary: A: Bromocriptine - Decreases pituitary prolactin secretion. B: Cabergoline - Decreases pituitary prolactin secretion. C: Pergolide - Decreases pituitary prolactin secretion. All choices are correct as they are dopamine agonists that decrease pituitary prolactin secretion.

Correct Answer: D

Rationale: The correct answer is D because aspirin can cause gastric upset, salicylism symptoms like vomiting, tinnitus, decreased hearing, and vertigo, as well as gastric ulcers and upper gastrointestinal bleeding. Aspirin is known to irritate the stomach lining, leading to gastric upset and ulcers. Salicylism symptoms are characteristic of aspirin toxicity. Gastrointestinal bleeding is a serious side effect of aspirin due to its effect on blood clotting. Choices A, B, and C individually describe common side effects of aspirin, but only choice D encompasses all the side effects associated with aspirin use.

Correct Answer: B

Rationale: The class of OKT-3 is monoclonal antibodies. OKT-3 is a specific monoclonal antibody used for immunosuppression in organ transplant recipients. Monoclonal antibodies are designed to target specific antigens or proteins in the body. Other choices are incorrect as interferons are cytokines, immunoglobulins are antibodies produced by plasma cells, and immunosuppressive agents are a broad category that includes various drugs targeting the immune system.

Correct Answer: C

Rationale: Step-by-step rationale: 1. Polar bear liver contains high levels of Vitamin A. 2. Excessive Vitamin A intake can lead to acute poisoning. 3. Symptoms of Vitamin A poisoning include nausea, vomiting, dizziness, and even death. 4. Thus, ingestion of polar bear liver can cause acute poisoning due to Vitamin A overload. Summary: A: Vitamin D - Incorrect. Polar bear liver does not contain toxic levels of Vitamin D. B: Vitamin E - Incorrect. Vitamin E toxicity is rare and not associated with polar bear liver ingestion. C: Vitamin A - Correct. Polar bear liver is high in Vitamin A, leading to acute poisoning if consumed in excess. D: Vitamin C - Incorrect. Vitamin C toxicity is unlikely from consuming polar bear liver.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Gemfibrozil (Lopid) is known to be more effective at increasing HDL cholesterol levels compared to clofibrate (Atromid-S). This is supported by clinical studies showing a greater impact on HDL concentrations with gemfibrozil. Choice B is incorrect as it contradicts the established evidence. Choices C and D are also incorrect as they do not accurately reflect the comparative efficacy between Gemfibrozil and clofibrate in increasing HDL cholesterol levels.