Xiao Ming forgot the day of the week today, so he asked O, P, Q. O replied: "I also forgot the day of the week today, but you can ask P and Q. " P replied: "Yesterday It ’s my day to lie. "Q ’s answer is the same as P. Known: ① O never lied; ② P lied on three days Monday, Tuesday, Wednesday, and told the truth the rest; ③ Q on Thursday, Friday, Saturday Lie for three days, and tell the truth the rest. According to the above conditions, what day is today? ['Monday.', 'Tuesday.', 'Thursday.', 'Sunday.']