Discussion
Assertion (A): FOLLOW sets are needed to build a predictive parsing table even though FIRST sets alone identify the productions.
Reason (R): A production deriving epsilon matches no input, so the decision must rest on what may come after the nonterminal.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. A production deriving epsilon has an empty FIRST set, so nothing in the input can indicate that it is the right choice. The parser must instead ask whether the lookahead is something that could legitimately follow the nonterminal, and FOLLOW is exactly that set.
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