 Within the category of responsive predicates Lahiri (2002, 287) distinguishes the veridical from the non-veridical. Veridical-responsive predicates include ‘know’, ‘remember’, and ‘forget’; non-veridical-responsive predicates include ‘be certain’, ‘agree (about)’, and ‘conjecture (about)’. Whereas a veridical-responsive predicate expresses a relation to the correct answer to its interrogative complement, a non-veridical-responsive predicate expresses a relation to a possible (but not necessarily the correct) answer. For example, ‘Jane remembers who won the lottery’ entails that Jane has knowledge that correctly answers the question ‘Who won the lottery?’, whereas ‘Jane is certain about who won the lottery’ entails that Jane is certain of the truth of a proposition that may or may not correctly answer that same question. 