question: A 50-year-old man consults a physician because of a lesion on his nose. On examination, a flesh-colored lesion about 1 cm in diameter, with a rolled edge and central ulceration, is oserved. Which of the following is the probable diagnosis?
opa: Basal cell carcinoma
opb: Eczema
opc: Psoriasis
opd: Urticaria