This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
According to NYHA grading, Patients with marked limitation to physical activity belongs to 
Select and explain. 
A. Grade I, B. Grade II, C. Grade III, D. Grade IV
C: Grade III
Answer: C: Grade III 
Explanation: New York Hea Association Functional Classification of Cardiac diseaseGrade I: Patients have no limitation of physical activityGrade II: Patients have slight limitation of physical activityGrade III: Patients have marked limitation of physical activityGrade IV: Patients have an inability to carry on the physical activity without symptomsReference: Practical Guide to High-Risk Pregnancy and Delivery; Chapter 20; Cardiac Disease and Pregnancy