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': 'Anti Ul-RNP antibody is seen in? \nSelect and explain. \nA. SLE, B. Scleroderma, C. MCTD, D. Derniatomyositis', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., MCTDo Mixed connective tissue disease (MCTD) is characterized serologically by high titers of antibodies to ribonucleoprotein paicle-containing Ul ribonucleoprotein (Anti-Ul RNP)", 'role': 'assistant'}]