Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Example Input: Cannons are a three ball shot from a corner spot or on the ____ yard line.\Question: Choose the right answer from options given a) no b) four c) five d) one
Example Output: d

Example Input: Pistillate flowers have a compound ovary with ____ locules topped by three sticky, sessile stigmas.\Question: Choose the right answer from options given a) zero b) three c) six d) seven
Example Output: b

Example Input: Teething begins for most babies around ____ to six months.\Question: Choose the right answer from options given a) three b) four c) five d) seven
Example Output:
b