Correct Answer: B

Rationale: The correct answer is B: Clients with metal implants in their body. An MRI uses strong magnetic fields, which can interact with metal implants, causing movement or heating of the metal and potential harm to the client. This could lead to serious injuries or complications during the scan. Overweight clients (choice A), clients over the age of 60 (choice C), and clients with brain tumors (choice D) do not have contraindications for an MRI scan.

Correct Answer: D

Rationale: The correct answer is D: Hypocalcemia. The parathyroid glands regulate calcium levels in the body. Without them, calcium levels will drop, leading to hypocalcemia. A: Hypomagnesemia is incorrect because magnesium levels are not directly regulated by the parathyroid glands. B: Hyperkalemia and C: Hypernatremia are incorrect as they are not typically associated with parathyroid gland removal. In summary, the removal of parathyroid glands would result in hypocalcemia due to the disruption of calcium regulation in the body.

Correct Answer: A

Rationale: The correct answer is A: Have a digital rectal examination and prostate-specific antigen (PSA) test done yearly. This is because regular screening with both tests can help detect prostate cancer early. The digital rectal exam allows the doctor to feel for any abnormalities in the prostate gland, while the PSA test measures the levels of a specific protein produced by the prostate gland. If there are any concerning findings, further diagnostic tests can be done to confirm prostate cancer. Choice B is incorrect because transrectal ultrasound is not a recommended screening test for prostate cancer. Choice C is incorrect as testicular self-examinations are for detecting testicular cancer, not prostate cancer. Choice D is incorrect as CBC, BUN, and creatinine levels are not specific tests for prostate cancer screening.

Correct Answer: B

Rationale: The correct answer is B (AB). AB blood type is the rarest because it is a result of inheriting both A and B alleles, making it less common in the population. AB individuals can only receive blood from other AB individuals due to their unique antigens. Blood types A, B, and O are more common in the population, with O being the most common as it is the universal donor. Blood type A and B are more common than AB since they only require one allele for their respective antigens. Thus, the rarity of AB blood type is due to the inheritance of both A and B alleles, making it the least common among the choices provided.

Correct Answer: D

Rationale: The correct answer is D. In Addison's disease, the adrenal glands do not produce enough cortisol and aldosterone. This leads to sodium and potassium imbalances. Low aldosterone causes sodium loss and potassium retention, resulting in sodium and potassium abnormalities. The other choices, A, B, and C, do not directly relate to Addison's disease. Calcium and phosphorus abnormalities are not typically associated with Addison's disease. Sodium and chloride, and chloride and magnesium imbalances are not primary concerns in Addison's disease. Therefore, staying alert for signs and symptoms of sodium and potassium abnormalities is crucial in managing and monitoring a client with Addison's disease.