Correct Answer: C

Rationale: Marion's presentation of back pain associated with constipation and urinary retention is concerning for cauda equina syndrome. Cauda equina syndrome is a rare but serious condition caused by the compression of the bundle of nerves at the bottom of the spinal cord, known as the cauda equina. This compression can result in a variety of symptoms, including back pain, sciatica, changes in bowel and bladder function (such as constipation and urinary retention), as well as lower extremity weakness or numbness.

Correct Answer: B

Rationale: The presentation of multiple burning erosions on the shaft of the penis along with tender inguinal adenopathy is indicative of genital herpes caused by the herpes simplex virus (HSV). Primary herpes simplex infection typically presents with painful ulcers and lymphadenopathy. The ulcers are often shallow with well-defined borders and can be associated with systemic symptoms such as fever and malaise. In contrast, primary syphilis is characterized by a painless chancre at the site of infection, usually on the genitals. Chancroid can also present with painful ulcers, but it is less common in developed countries. Gonorrhea typically presents with urethral discharge, dysuria, or other symptoms of urethritis, rather than erosions on the penis shaft.

Correct Answer: A

Rationale: When examining a patient with known peripheral vascular disease in the legs, it is important to note the size, symmetry, and skin color of the lower extremities. These aspects can provide valuable information about the circulation and potential complications related to the disease. Changes in size, such as muscle wasting or atrophy, can indicate poor circulation and muscle ischemia. Asymmetry between the two legs may point to a significant difference in blood supply to the limbs. Skin color changes, such as pallor or cyanosis, can suggest impaired blood flow. Monitoring and documenting these findings are crucial for assessing the progression or improvement of the disease and guiding treatment interventions.

Correct Answer: A

Rationale: While the description provides information about the duration, frequency, onset, and relieving factors of Jason's shortness of breath, it does not mention the severity of the symptom. Severity refers to the intensity or degree of the symptom, such as mild, moderate, or severe. In this case, we do not have information about how Jason would rate the severity of his shortness of breath. It can be an important attribute to consider when assessing the impact of the symptom on the individual's quality of life and the potential urgency of intervention.

Correct Answer: B

Rationale: In the given scenario, being a 35-year-old archaeologist with fair skin, a family history of melanoma, and many freckles scattered across her skin are all risk factors for melanoma. Age (choice A) is a relevant risk factor as melanoma incidence increases with age. Actinic lentigines (choice C), also known as sunspots, are precancerous skin lesions that can increase the risk of developing melanoma. Heavy sun exposure (choice D) is a significant risk factor as cumulative sun exposure over time can contribute to the development of melanoma.