This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: general microbiology, Subject name: Microbiology
Widal test is a method of? 
Select and explain. 
A. Direct Coomb's test, B. Indirect Coomb's test, C. Tube agglutination test, D. Precipitation test
C: Tube agglutination test
Answer: C: Tube agglutination test 
Explanation: For Typhoid