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: Microbiology
In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by: 
Select and explain. 
A. Blood culture, B. Widal test, C. Stool culture, D. Urine culture
C: Stool culture
Answer: C: Stool culture 
Explanation: None