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: Pathology
[{'content': 'OVAL cells seen in stem cells of - \nSelect and explain. \nA. Liver, B. Skin, C. Cornea, D. Bone', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stem cells are located in sites called niches. These include:\n\nEpidermal stem cells located in the bulge area of the hair follicle serve as stem cells for the hair\xa0follicle and the epidermis.\nIntestinal stem cells are located at the base of a colon crypt, above Paneth cells.\nLiver stem cells (commonly known as OVAL cells) are located in the canals of Hering, structures\xa0that connect bile ductules with parenchymal hepatocytes.\nCorneal stem cells are located in the limbus region, between the conjunctiva and the cornea\nThe bone marrow contains hematopoietic stem cells as well as stromal cells capable of\xa0differentiation into various lineages.', 'role': 'assistant'}]