This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Scabies and other infestations, Subject name: Dental
[{'content': "Chiclero's ulcer caused by:- \nSelect and explain. \nA. Leishmania Mexicana, B. Lesihmania braziliense, C. Leishmania aethiopica, D. Leishmania donovani", 'role': 'user'}, {'content': "Answer: A \nExplanation: Chiclero ulcer ( gum tree harvestor's ulcer) seen in leishmania Mexicana (New world) Leishmania C/B Cutaneous Mucocutaneous Visceral New world- L. Maxicana- chiclero ulcers (Gum tree harvestor's ulcer) Old world- L. Major- Delhi boils ulcers with central crusting Skin mucosa involved mutilation present: ESPUNDIA L. Donovani (PKDL) - Nodule (face) Hypopigmented (trunk) Past H/o fever Nerve thickening absent Endemic -Bihar", 'role': 'assistant'}]