Read the sentence given below to find out if it contains any error. The error, if any, will be in one part of the sentence. If the sentence is error free, select No error or option 5. Ignore error of punctuation if any.

Pterosaurs appeared in fossil records from the (A)/ Triassic period, about 225m years ago, but (B)/ disappeared at the end of Cretaceous period, (C)/ approximately 66m years ago. (D)/ No error (E)