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: Quarks also come in ____ 'colours', terms for a property a little like electrical charge.\Question: Choose the right answer from options given a) three b) nine c) six d) no

Output: a


Input: Consider Input: Respiratory therapists complete ____ to four years of education.\Question: Choose the right answer from options given a) one b) nine c) zero d) two

Output: d


Input: Consider Input: Conjugation occurs when bacteria is passed through ____ joined prokaryotes.\Question: Choose the right answer from options given a) five b) eight c) two d) three


Output: c