Choice A rationale:

Infertility is a potential complication of some STIs, such as gonorrhea and chlamydia, but it is not the highest priority when educating a client diagnosed with syphilis.

Syphilis can lead to more immediate and life-threatening complications.

Choice B rationale:

Paralysis is not a common complication of syphilis.

Syphilis primarily affects various body systems, including the cardiovascular and nervous systems, but it does not typically lead to paralysis.

Choice C rationale:

Aortic aneurysms are a significant concern in clients with syphilis, especially in its later stages (tertiary syphilis).

Syphilis can cause damage to the aorta, leading to the development of aneurysms.

These aneurysms can be life-threatening if they rupture, making them a high-priority complication to educate the client about.

Choice D rationale:

Cognitive impairment can occur in late-stage syphilis, known as neurosyphilis, but it is not the highest priority complication to address initially.

Aortic aneurysms are more immediate and potentially life-threatening, so they should be prioritized in client education.