This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Medicine
Relative risk of developing TB in patients already infected with TB bacilus is highest in - 
Select and explain. 
A. Diabetes, B. Recent infection, C. Post transplantation, D. Malnutrition
C: Post transplantation
Answer: C: Post transplantation 
Explanation: Ans. is 4c' i.e., Post transplantation Relative risk of developing T.B.Post transplantation20-70HIV30Silicosis30Recent infection12Diabetes3-4Malnutrition2-3