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
Anti Ul-RNP antibody is seen in? 
Select and explain. 
A. SLE, B. Scleroderma, C. MCTD, D. Derniatomyositis
C: MCTD
Answer: C: MCTD 
Explanation: 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)