This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
One TB infected person can infect how many people in 1 yr - 
Select and explain. 
A. 20, B. 30, C. 10, D. 5
C: 10
Answer: C: 10 
Explanation: An estimated annual average of 10-15 persons contact the infection from one case of infectious pulmonary TB. Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :181