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: Medicine
Feature of hemorrhagic disease of new born is - 
Select and explain. 
A. Prolonged prothrombin time, B. Defective platelet count, C. Prolonged bleeding time, D. Prolonged thrombin time
A: Prolonged prothrombin time
Answer: A: Prolonged prothrombin time 
Explanation: None