Task: Pos Tagging
Input (English): Sentence: True , but two in England that we know of were a part of the Essex entourage : Dr. Lopez , who had been physician to Essex ' step - father , the Earl of Leicester , had apparently treated the young Essex for some socially unacceptable ailment , and Antonio Perez , who was {{ a }} guest at Essex House in the early 1590's . 
Word: a
Output (English): DET