This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
To differentiate restrictive cardiomypathy and constrictive pericarditis, features ouring constrictive pericarditis are- 
Select and explain. 
A. Diastolic pressures are not equalised, B. There is mild pericardial effusion, C. Associated with septal hyperophy, D. Thick pericardium is present
D: Thick pericardium is present
Answer: D: Thick pericardium is present 
Explanation: Ref: Harrison's 19th E pg 1573 Table 288-2. Thickened pericardium seen in constrictive pericarditis. Because constrictive pericarditis can be corrected surgically, it is impoant to distinguish chronic constrictive pericarditis from restrictive cardiomyopathy, which has a similar physiologic abnormality (i.e., restriction of ventricular filling).