Task: Question Answering
Input (English): Question: A box contains ten bulbs out of which 5 are defective. If four bulbs are chosen at random, find the probability that exactly two bulbs are good?

 Option A: 7/21

 Option B: 10/21

 Option C: 9/21

 Option D: 8/21

 Option E: 5/21
Output (English): Option B