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: Females have two X-chromosomes, ____ from each parent.\Question: Choose the right answer from options given a) ten b) four c) one d) zero
Example Output: c

Example Input: Parliaments can last five years, often last ____ and a bit.\Question: Choose the right answer from options given a) four b) three c) five d) two
Example Output: a

Example Input: Young girls keep their hair cut very short until they are about ____ years old.\Question: Choose the right answer from options given a) two b) six c) seven d) four
Example Output:
c