Task: Question Answering
Input (English): Question: If r = 2^3 * 5^2 * 7 and s = 2^3 * 3^2 * 5, which of the following is equal to the greatest common divisor of r and s?

 Option A: 2 * 5

 Option B: 2^3 * 5

 Option C: 2^3 * 5^2

 Option D: 2*3*5*7

 Option E: 2^3 * 3^2 *5^2 * 7
Output (English): Option B