A patient presents with a painful, vesicular rash following a linear pattern on the left forearm. The patient reports a history of gardening without gloves. Which of the following conditions is most likely responsible for this presentation?

Correct Answer: B

Rationale: The correct answer is B: Herpes simplex virus infection. The presentation of a painful, vesicular rash following a linear pattern on the left forearm is characteristic of herpes simplex virus infection, specifically herpes zoster (shingles). The linear pattern is due to the virus following a specific nerve pathway. This is different from the other choices - A: Allergic contact dermatitis typically presents as a diffuse rash at the site of contact with an allergen, not a linear pattern. C: Scabies presents with burrows and papules, not vesicles in a linear pattern. D: Poison ivy dermatitis causes a diffuse rash, not a linear vesicular rash.

Correct Answer: C

Rationale: The correct answer is C: Group A beta-hemolytic Streptococcus (GAS). GAS is the most likely organism responsible for this presentation, known as acute bacterial tonsillitis. GAS commonly causes symptoms such as throat pain, odynophagia, fever, tonsillar enlargement with exudates, and cervical lymphadenopathy. Streptococcal pharyngitis is a common bacterial infection of the throat caused by GAS. The other options are less likely as Streptococcus pneumoniae typically causes pneumonia and Haemophilus influenzae is associated with respiratory tract infections. Epstein-Barr virus (EBV) commonly causes infectious mononucleosis, which presents with different symptoms than those described in the question.

Correct Answer: C

Rationale: The correct answer is C: Nasal polyps. Nasal polyps are benign growths that form in the nasal cavity and sinuses, leading to symptoms such as chronic nasal congestion, hyposmia, and anosmia. The presence of polypoid masses seen on nasal endoscopy is characteristic of nasal polyps. Rationale: 1. Chronic nasal congestion, hyposmia, and anosmia are common symptoms of nasal polyps. 2. Nasal endoscopy revealing polypoid masses confirms the presence of nasal polyps. 3. Allergic rhinitis may cause nasal congestion but does not typically present with polypoid masses. 4. Chronic sinusitis can cause nasal congestion but is usually associated with inflammation of the sinuses, not just polypoid masses. 5. A deviated nasal septum can lead to nasal congestion but does not typically cause polypoid masses obstructing the nasal cavity and sinuses.

Correct Answer: A

Rationale: The correct answer is A: Anterior uveitis. This condition presents with redness, pain, and photophobia due to inflammation of the uveal tract. Ciliary injection, corneal edema, and mid-dilated pupil with fixed reaction to light are classic signs of anterior uveitis. The other choices can be ruled out based on specific findings: B: Acute angle-closure glaucoma would present with a high intraocular pressure, not fixed dilated pupil. C: Endophthalmitis typically presents with severe pain, hypopyon, and vitreous inflammation. D: Corneal abrasion would not cause ciliary injection or fixed dilated pupil.

Correct Answer: A

Rationale: The correct answer is A: Central retinal artery occlusion. This condition presents with sudden-onset, painless vision loss, cherry-red spot at the macula due to lack of blood flow, and attenuated retinal vessels. The cherry-red spot is due to the transparency of the fovea when there is ischemia in the surrounding retina. Central retinal vein occlusion (B) presents with sudden vision loss accompanied by retinal hemorrhages and dilated tortuous veins. Retinal detachment (C) typically presents with sudden flashes, floaters, and a curtain-like visual field defect. Acute angle-closure glaucoma (D) presents with severe eye pain, blurred vision, halos around lights, and a fixed mid-dilated pupil.