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: Biochemistry
[{'content': 'Which amongst the following a marker of carinoma? \nSelect and explain. \nA. Cytokeratin, B. Vimentin, C. Calretinin, D. CD45', 'role': 'user'}, {'content': "Answer: A \nExplanation: Cvtokeratins are a class of intermediate filaments that demonstrates epethelial differentiation and are the most commonly used marker to identify 'Carcinomas'.", 'role': 'assistant'}]