This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Erythmato-Squamous and Lichenoid Eruption, Subject name: Skin
[{'content': '"Herald patch" is characteristic feature of - \nSelect and explain. \nA. Pityriasis rubra pilaris, B. Psoriasis, C. Lichen planus, D. Pityriasis rosea', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Pityriasis rosea o Herald patch or mother patch is a characteristic feature of P. rosea.o P. rosea is a common scaly disorder, occuring usually in children and young adults (10-35 years). Characterized by round/oval pink brown patches with a superficial, centrifugal scale, distributed over trunk in a Christmas tree pattern. The disease is thought to be viral disease, is self limiting, and subsides in 6-12 weeks. The exact etiology is not known, but it is considered to be a viral disease; Human Herpes virus 6 (HHV 6) and Human Herpes virus 7 (HHV 7) may play a role.Clinical manifestations of P. roseao The disease starts with an upper respiratory prodrome or a mild flu. After 1-2 weeks, Annular erythmatous plaque appears on trunk that is referred to as mother patch or herald patch. Over the next 1 -2 weeks, fresh patch appear all over the trunk, in a Christmas tree configuration or Fir tree Configration. The lesions are pinkish in white skin, hence the name rosea. However, on the dark Indian skin the lesions are skin coloured or brown. The most characteristic clue for the diagnosis is the presence of a fine scale at the edge of the lesion referrred to as centrifugal scale or collarette scales or cigarette paper scales. Lesions subside with hyperpigmentation. Trunk is involved predominantly, Sometimes (in 20% of patients) lesions occur predominantly on extremities and neck (inverse pattern).o Hanging curtain sign is seen in patients with pityriasis rosea. When the skin is stretched across long axis of herald patch, the scale is noted to be finer, lighter, and attached to one end, which tends to fold across the line of scratch.Drug induced pityriasis roseao Some drugs may cause pityriasis rosea like skin lesions. Drugs causing pityriasis rosea like drug eruptions are : -# ACE inhibitors# Gold# Methotrexate# Metronidazole# Isotretinoin# b-blockers# Bismuth# Barbiturates# D- Penicillamine", 'role': 'assistant'}]