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
The treatment of a patient with myocardial infarction is thrombolytic therapy, if the patient presents within ---- hours of Chest pain - 
Select and explain. 
A. 6 hours, B. 12 hours, C. 18 hours, D. 24 hours
D: 24 hours
Answer: D: 24 hours 
Explanation: None