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
Diagnosis of typhoid in the first week is by - 
Select and explain. 
A. Widal test, B. Stool culture, C. Urine culture, D. Blood culture
D: Blood culture
Answer: D: Blood culture 
Explanation: None