Vasopressin possesses the following:

Correct Answer: A

Rationale: The correct answer is A: Vasopressin possesses antidiuretic properties. Vasopressin, also known as antidiuretic hormone (ADH), acts on the kidneys to increase water reabsorption, reducing urine output and conserving water in the body. This helps maintain body fluid balance and prevent dehydration. Choice B is incorrect because vasopressin actually has vasoconstrictive properties, not vasodilatory properties. Choice C is incorrect because vasopressin does not stimulate the release of thyroid hormones. Choice D is also incorrect because vasopressin is known for its antidiuretic effect, not diuretic effect.

Correct Answer: A

Rationale: The correct answer is A: TRUE. Ketoprofen is indeed a propionic acid derivative that inhibits both cyclooxygenase and lipoxygenase nonselectively. This is because ketoprofen belongs to the class of nonsteroidal anti-inflammatory drugs (NSAIDs), which work by inhibiting cyclooxygenase enzymes to reduce inflammation and pain. Additionally, ketoprofen has been shown to inhibit lipoxygenase, another enzyme involved in the inflammatory process. Therefore, this statement accurately describes the pharmacological actions of ketoprofen. Choices B and C are incorrect because the statement is true, and choice D is incorrect as it suggests all options are correct when only option A is accurate in this case.

Correct Answer: D

Rationale: Interferon gamma is associated with the side effect of fatigue due to its immunomodulatory effects causing systemic symptoms. This side effect is commonly reported in patients receiving interferon therapy. Hypertension, pulmonary edema, and nephrotoxicity are not typically linked to interferon gamma therapy. Thus, the correct answer is D.

Correct Answer: D

Rationale: The correct answer is D - All of the above. Cholestyramine binds bile acids, leading to malabsorption of fat-soluble vitamins like vitamin K. Coumarins inhibit the recycling of vitamin K epoxide, reducing its availability. Certain antibiotics disrupt gut flora, affecting vitamin K production. Therefore, all choices prevent vitamin K from exerting its metabolic effects.

Correct Answer: A

Rationale: The correct answer is A because drug combinations are likely synergistic when they target different steps in the same pathway, resulting in additive or synergistic effects. This increases efficacy and reduces side effects. Choice B is incorrect as the statement is true. Choices C and D are incorrect as they are not valid options in this context.