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: Ultrasonic liposuction fits into ____ categories.\Question: Choose the right answer from options given a) two b) seven c) nine d) one
Example Output: a

Example Input: Conflict occurs between when ____ people have a car accident.\Question: Choose the right answer from options given a) no b) eight c) two d) nine
Example Output: c

Example Input: People have ____ sets of chromosomes.\Question: Choose the right answer from options given a) three b) six c) eight d) two
Example Output:
d