This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fungal infections, Scabies, Pediculosis, Subject name: Dental
[{'content': 'Spaghetti and meat ball appearance is seen with- \nSelect and explain. \nA. Pityriasis rosea, B. Pityriasis versicolor, C. Acne rosacea, D. Lichen planus', 'role': 'user'}, {'content': 'Answer: B \nExplanation: <p>PITYRIASIS VERSICOLOR:- Tinea versicolor. Macules with fine scaling. Causative organism: dimorphic fungi.genus Malassezia globosa and M.furfur. Clinical features:- Hypo/hyperpigmented macules with fine ,branny scales. The lesions may coalesce to involve large areas,forming map like structures. Scraping the surface will accentuate the scaling,known as scratch sign or coup d&;ongle sign or Besnier sign. Sites involved-upper trunk( mainly). Also affect face and flexural areas. Investigation:- Wood&;s lamp examination - golden yellow flourescence. Scraping and direct microscopy after adding KOH will demonstrate presence of both yeast and hyphal forms.This appearance is called as "spaghetti and meatball" appearance. {Reference: IADVL textbook of dermatology, vishalakshi Vishwanath pg no.52}</p>', 'role': 'assistant'}]