Read the following passage and solve the questions based on it.
P, Q, R, S, T and U are six lecturers in a college each teaching a different subject Mathematics, Physics, Sociology, Biology, Geography and History not necessarily in the same order. There are only four female lecturers. Following is the information regarding who teaches what:
(i) Q teaches History.
(ii) No female lecturer teaches Biology or Mathematics.
(iii) S, who teaches Sociology, is the oldest.
(iv) P is older than R and teaches Physics.
(v) The youngest teaches Biology and U is not the youngest.
(vi) T teaches Mathematics and is older than P but younger than Q and U.
Who teaches Biology?