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').

Ex Input:
Pistillate flowers have a compound ovary with ____ locules topped by three sticky, sessile stigmas.\Question: Choose the right answer from options given a) zero b) three c) six d) seven

Ex Output:
b


Ex Input:
Motor neurons are divided into ____ groups.\Question: Choose the right answer from options given a) two b) six c) seven d) eight

Ex Output:
a


Ex Input:
Deserts originate by several different mechanisms that result in ____ types of deserts.\Question: Choose the right answer from options given a) six b) no c) seven d) five

Ex Output:

d