Correct Answer: D

Rationale: Hypertension, or high blood pressure, is not typically associated with causing ulcers in the lower extremities. The most common causes of lower extremity ulcers are arterial insufficiency, venous insufficiency, and diminished sensation in pressure points. Arterial insufficiency leads to decreased blood flow to the lower extremities, causing tissue damage and ulcers. Venous insufficiency results in poor circulation and increased pressure in the veins, leading to ulcers. Diminished sensation in pressure points, often seen in conditions like diabetes, can cause ulcers due to lack of feeling and increased risk of trauma. So, hypertension is not directly related to the development of lower extremity ulcers.

Correct Answer: D

Rationale: Finding a bounding carotid pulse suggests a wide pulse pressure, which can be associated with aortic insufficiency. Aortic insufficiency (also known as aortic regurgitation) is characterized by the backflow of blood from the aorta into the left ventricle during diastole due to incomplete closure of the aortic valve. This results in increased stroke volume and left ventricular pressure, leading to widened pulse pressure and a bounding arterial pulse. Therefore, when a bounding carotid pulse is detected in a patient, it is important to search for signs and symptoms of aortic insufficiency, such as a diastolic murmur heard best at the left sternal border and radiating to the neck.

Correct Answer: A

Rationale: The patient in the case presented has multiple moist papules on the penile shaft and corona, which are classic features of condylomata acuminata, also known as genital warts. Condylomata acuminata are caused by the human papillomavirus (HPV) and are typically painless, unlike other conditions such as genital herpes or syphilitic chancre which may be associated with pain or tender sores. Given the patient's history of multiple sexual partners and lack of condom use with his current girlfriend, there is a higher likelihood of exposure to HPV. Condylomata acuminata can be treated with various options including topical agents, cryotherapy, or surgical removal, and it is important to address the potential risk of HPV transmission to sexual partners.

Correct Answer: A

Rationale: The presence of a firm and immobile mass felt against the bowel wall during a rectal examination is concerning for a potential malignancy, such as colon cancer. Other conditions such as hemorrhoids or anal fissures are typically not associated with a mass that is firm and immobile. The "Valve of Houston" is a term that does not pertain to this scenario and is not a recognized medical entity. Therefore, the most likely diagnosis based on the given information is colon cancer, and further evaluation such as a colonoscopy would be warranted for definitive diagnosis and management.

Correct Answer: A

Rationale: Rheumatoid arthritis is a systemic autoimmune disease that primarily affects the joints. It commonly presents with pain, swelling, and stiffness in multiple small joints such as those in the hands, wrists, and feet. It is more prevalent in females in their 30s to 50s. Rheumatoid arthritis is characterized by chronic inflammation of the synovial membrane, leading to joint damage and deformities over time. Laboratory tests showing elevated inflammatory markers, such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), along with positive rheumatoid factor and anti-cyclic citrullinated peptide (anti-CCP) antibodies, can help in confirming the diagnosis of rheumatoid arthritis.