Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statements:
No police officer is a doctor.
Some doctors are specialists.
All engineers are doctors.

Conclusions:
I. Some engineers are police officers.
II. No engineer is a police officer.
III. Some doctors are engineers.