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: Distilled water enters the body with ____ minerals but leaves the body with minerals.\Question: Choose the right answer from options given a) zero b) no c) one d) nine
Example Output: b

Example Input: Brain death occurs in just four to ____ minutes unless the heart rhythm is restored.\Question: Choose the right answer from options given a) ten b) three c) six d) nine
Example Output: c

Example Input: Yoga is a stepwise, stage wise ____ fold path to final liberation from pain and suffering.\Question: Choose the right answer from options given a) eight b) six c) nine d) one
Example Output:
a