Which of the following blood types would the nurse identify as the rarest?

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: B

Rationale: The correct answer is B because hyperkalemia presents with symptoms such as muscle weakness, diarrhea, and ECG changes. Muscle weakness is a common sign due to potassium's effect on neuromuscular function. Diarrhea can lead to potassium loss. ECG changes, such as peaked T waves and widened QRS complexes, indicate cardiac involvement. Assessing for these symptoms helps monitor the severity of hyperkalemia and guide treatment. Other choices are incorrect because assessing for fever and chest pain (choice A) are not specific to hyperkalemia. Encouraging fluid restriction (choice C) may not directly address hyperkalemia. Preparing for a cardiac ultrasound (choice D) is not an immediate intervention for hyperkalemia.

Correct Answer: D

Rationale: The correct answer is D, a behavior change. Urinary retention in older adults with a neurologic deficit can manifest as a behavior change, such as increased agitation, confusion, or restlessness due to discomfort from the inability to empty the bladder. Amnesia (A) is memory loss and not directly related to urinary retention. Hypertension (B) and hypotension (C) are related to blood pressure regulation and are not specific signs of urinary retention. In contrast, a behavior change (D) is a common and characteristic sign indicating urinary retention in this population.

Correct Answer: D

Rationale: The correct answer is D: Cryptorchidism. Cryptorchidism, or undescended testicle, is a known risk factor for testicular cancer as the undescended testicle is more prone to developing cancerous changes. This condition increases the risk of testicular cancer even if the testicle is surgically corrected later in life. Other choices like A (Testosterone therapy during childhood) and B (Sexually transmitted disease) are not linked to testicular cancer. Choice C (Early onset of puberty) is not a direct risk factor for testicular cancer.

Correct Answer: D

Rationale: The correct answer is D: All of the above. Malignant melanoma, basal cell epithelioma, and squamous cell carcinoma are all forms of skin cancer associated with prolonged sun exposure. Melanoma is the deadliest form, originating in melanocytes; basal cell and squamous cell carcinomas are more common but less aggressive. All three types can develop due to cumulative UV radiation exposure. Therefore, all options are correct in this context.