This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'Multiple erythematous annular lesions with peripheral collorette of scales arranged predominantly on trunk are seen in – \nSelect and explain. \nA. Pityriasis vesicular, B. Pytiriasis rubra pilaris, C. Pityriasis rosea, D. Pityriasis lichennoides chronica', 'role': 'user'}, {'content': 'Answer: C \nExplanation: PITYRIASIS\n\nThe term pityriasis is used to describe skin condition in which the scale appears similar to bran. So, any skin\xa0disease with pityriasis in its name will be scaly.\n\nDifferential diagnosis of different Pitriasis\nPityriasis rosea\n\n\nChildren and young adults\nErythmatous annular plaque → Mother patch (Herald patch)\nMainly involves Trunk.\nChristmas tree or Fir tree configration\nCollarette scales (cigar paper scale)\nSelf limiting course\n\nPityriasis rubra pilaris\n\nTwo peaks →\xa05-10 years and 40-60 years\nElythmatous (orange to pink), follicular, scaly plaques\nCharacteristic presence of distinct island of normal skin\nInvolvement of trunk with cranio caudal distribution\nNutmeg papules on knuckles\nThickening of palms (Palmer thickening) & soles (keratoden-nic sandals)\n\nPityriasis lichenoides\n1)\xa0\xa0\xa0Pityriasis lichenoides et variolifermis acuta\n\nConstitutional symptoms; fever, arthralgia\nMultiple erythmatous & edematous papules often surmounted by vesicles\nLesions heal with hyperpigmented scar\xa0\nTrunk and flexures of arm\n\n2)\xa0Pityriasis lichenoides chronica\n\nSuccessive crops of red-brown papules which are surmounted by a central adherent mica like scales\nLesions heal with hypopigmentation\nTrunk and proximal part of extremities\n\nPityriasis alba\n\nChildren (6-12 years)\nHypopigmented macule on face\nPresence of fine scales\n\nPityriasis versicolor\n\nYoung adults\nHypopigmented macule\nFine scales →\xa0Furfuraceous or rice powder like scales\nInvolvement of Trunk and shoulder (chest & backs)\n\nNote\xa0- Pityriasis Rosea, Pityriasis rubra pilaris and pityriasis lichenoides are papulosquamous lesions, whereas pityriasis versicolor and pityriasis alba are not papulosquamous lesions.', 'role': 'assistant'}]