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: Social & Preventive Medicine
Which of the following strains of wild poliovirus forms the salk type 1 component of inactivated polio vaccine? 
Select and explain. 
A. MEF - 1, B. Mahoney, C. Saukett, D. Leningrad - 3
B: Mahoney
Answer: B: Mahoney 
Explanation: IPV is usually made from Mahoney (salk type I), MEF - 1 (salk type II) and saukett (salk type III) that are grown in cell culture. The harvested viral components are inactivated with formaldehyde. Leningrad - 3 is a strain of mumps virus used for making mumps vaccine. Ref: Park, Edition 21, Page - 185