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: Parapsychologists have ____ basic approaches to their subject matter.\Question: Choose the right answer from options given a) three b) two c) ten d) five
Example Output: b

Example Input: Aspiration pneumonia includes ____ syndromes based on the nature of the inoculum.\Question: Choose the right answer from options given a) three b) seven c) eight d) no
Example Output: a

Example Input: Women are ____ times more likely than men to be victims of rheumatoid arthritis .\Question: Choose the right answer from options given a) two b) three c) eight d) seven
Example Output:
b