This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
D-Dimer values may be increased in all of the following except 
Select and explain. 
A. Myocardial infarction, B. Pneumonia, C. Anticoagulant therapy, D. Pregnancy
C: Anticoagulant therapy
Answer: C: Anticoagulant therapy 
Explanation: The d-dimer assay is not specific. Levels increase in patients with myocardial infarction, pneumonia, sepsis, cancer, and the postoperative state and those in the second or third trimester of pregnancy. Therefore, d-dimer rarely has a useful role among hospitalized patients, because levels are frequently elevated due to systemic illness.Ref: Harrison's 18/e p2172, 17/e p2172