instruction:
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').
question:
Heme is made of ____ pyrrole groups united to form a porphyrin ring.\Question: Choose the right answer from options given a) five b) four c) eight d) six
answer:
b


question:
Plants have at least ____ sHSP gene families which comprise a large multigene family.\Question: Choose the right answer from options given a) zero b) eight c) five d) seven
answer:
c


question:
Ordinary tin is composed of ____ stable isotopes.\Question: Choose the right answer from options given a) seven b) ten c) nine d) no
answer:

c