This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vaccines, Subject name: Social & Preventive Medicine
Efficacy of BCG vaccine for Pulmonary Tuberculosis 
Select and explain. 
A. 0%, B. 25%, C. 33%, D. 50%
A: 0%
Answer: A: 0% 
Explanation: Efficacy of BCG Vaccine 0-80% (0% for pulmonary TB) Average 50% (50% for severe forms of TB)