Antibody is a protein substance produced in the blood or tissues in response to a specific antigen, such as a bacterium or a toxin that destroys or weakens bacteria and neutralizes organic poisons, thus forming the basis of immunity. This consideration is:

Correct Answer: A

Rationale: Rationale: 1. Antibodies are indeed protein substances produced in response to specific antigens. 2. Antibodies work by binding to antigens, marking them for destruction. 3. Antibodies play a crucial role in immune response and immunity. 4. Therefore, the statement accurately describes the role and function of antibodies. Summary: - Choice A is correct as it accurately describes the function of antibodies. - Choice B is incorrect as antibodies do play a role in immunity. - Choice C is incorrect as it implies all statements are true. - Choice D is incorrect as antibodies do exist and have a specific function.

Correct Answer: C

Rationale: The correct answer is C: Aminocaproic acid. Aminocaproic acid is a known fibrinolysis inhibitor that works by preventing the breakdown of blood clots. It does this by inhibiting the activation of plasmin, the enzyme responsible for breaking down fibrin clots. Clavulanic acid and sulbactam are both beta-lactamase inhibitors used in combination with antibiotics to prevent bacterial resistance. Disulfiram is an alcohol deterrent used in the treatment of alcoholism and does not have any direct relation to fibrinolysis inhibition.

Correct Answer: A

Rationale: Rationale: 1. Niacin commonly causes side effects like flushing and itching due to prostaglandin release. 2. Aspirin inhibits prostaglandin synthesis, reducing niacin-induced flushing. 3. Taking niacin with meals slows absorption, minimizing side effects. 4. Therefore, pretreatment with aspirin and taking niacin at the end of meals can reduce its side effects. Summary: - Choice B is incorrect as the statement is true based on the rationale provided. - Choice C is incorrect as it implies all options are true, which is not the case. - Choice D is incorrect as the statement is true, so none of the choices are correct.

Correct Answer: A

Rationale: The correct answer is A because hypophosphatemia can lead to proximal muscle weakness and osteomalacia due to inadequate phosphate levels affecting muscle and bone health. Choice B is incorrect as the statement in the question is true. Choice C is incorrect as not all choices are correct. Choice D is incorrect as the statement is true, so it cannot be none.

Correct Answer: B

Rationale: The correct answer is B: Amiloride (Midamor). Amiloride is a potassium-sparing diuretic that helps the body retain potassium. Administering it to patients already taking potassium supplements can lead to hyperkalemia, an excessive level of potassium in the blood, which can be dangerous. Hydrochlorothiazide (A) and Furosemide (C) are not potassium-sparing diuretics and do not pose the same risk of hyperkalemia. Choice D is incorrect because Amiloride specifically interacts with potassium levels, making it crucial to avoid concurrent use with potassium supplements.