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').

Input: Consider Input: Poodles have ____ legs.\Question: Choose the right answer from options given a) one b) four c) six d) nine

Output: b


Input: Consider Input: Pneumatic motor is a six-point unit with ____ pneumatics facing up and three facing down.\Question: Choose the right answer from options given a) five b) no c) three d) nine

Output: c


Input: Consider Input: Natural ytterbium is a mix of ____ stable isotopes.\Question: Choose the right answer from options given a) seven b) five c) eight d) zero


Output: a