Correct Answer: C

Rationale: The correct answer is C because the characteristics described (bleeding, not healing, ulcerated, indurated base) are indicative of a potential carcinoma, such as squamous cell carcinoma. These features raise concerns about malignancy and warrant immediate referral for further evaluation and management. Choices A, B, and D are incorrect because a benign sebaceous cyst (A) typically presents as a smooth, non-ulcerated mass, Darwin's tubercle (B) is a normal anatomical variation behind the ear and not associated with bleeding or ulceration, and a tophus (D) is a deposit of uric acid crystals seen in gout and would not present in this manner.

Correct Answer: A

Rationale: The correct answer is A: overlies the sclera. The bulbar conjunctiva is the transparent layer that covers the white part of the eye (sclera). This layer helps protect the eye and keeps it moist. It does not cover the iris and pupil (B), as that is the cornea's role. It is not visible at the inner canthus (C), which is where the lacrimal caruncle is located. Lastly, it is not a mucous membrane lining the lids (D), as that is the role of the palpebral conjunctiva. Therefore, the correct answer is A.

Correct Answer: C

Rationale: The correct answer is C: myxedema. This is a classic presentation of hypothyroidism, specifically myxedema, characterized by puffy eyes, coarse hair, and dry skin. The thyroid hormone deficiency leads to decreased metabolic activity, causing these symptoms. Cachexia (A) is severe muscle wasting seen in conditions like cancer. Cretinism (B) is congenital hypothyroidism leading to mental retardation. Scleroderma (D) is a connective tissue disorder causing skin thickening, not typically associated with these symptoms.

Correct Answer: A

Rationale: The correct answer is A: No sensation. When the sinus areas are normal, the patient should not feel any discomfort or pain upon palpation. This indicates that there is no inflammation or infection present. Choices B, C, and D are incorrect because feeling firm pressure, experiencing pain during palpation, or feeling pain behind the eyes would suggest abnormalities in the sinuses, such as congestion, inflammation, or infection. Therefore, the absence of any sensation is the expected response when the sinuses are normal.

Correct Answer: C

Rationale: The correct answer is C because the nurse should use the Snellen chart positioned 6.1 m (20 ft) away to assess visual acuity. This is the standard method for testing distance vision. The nurse should ask the patient to read the letters on the chart from the top row down, covering one eye at a time if necessary. This method provides an accurate measurement of visual acuity at a distance. A: Performing the confrontation test assesses visual fields, not visual acuity. B: Using a Jaeger card is for near vision testing, not distance visual acuity. D: Assessing the ability to read newsprint at a close distance does not provide an accurate measurement of visual acuity at a distance.