Aptitude Hack#1 (24-2-19)

Question:

There are 25 horses among which you need to find out the fastest 3 horses. You can conduct race among at most 5 to find out their relative speed. At no point, you can find out the actual speed of the horse in a race. Find out how many races are required to get the top 3 horses.

A) 5

B) 6 

C) 7

D) 8