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').

[Q]: Sexual maturity occurs at three to four years for females and ____ to five years for males.\Question: Choose the right answer from options given a) nine b) seven c) five d) four
[A]: d


[Q]: Most aphthous ulcers heal in one to ____ weeks.\Question: Choose the right answer from options given a) two b) eight c) one d) seven
[A]: a


[Q]: Chemotherapy is given intervenously every three to ____ weeks as tolerated for at least six cycles.\Question: Choose the right answer from options given a) zero b) ten c) four d) eight
[A]:
c