A 19-year-old male was found unconscious in his flat on 28 December at 23.00. He was taken immediately to hospital where his stomach was pumped. Although he regained consciousness he died shortly afterwards. Neighbours recall seeing various young people going into the flat at all hours of the day and night. Other facts known at this stage are: Peter Graick was a heroin addict. Empty bottles of spirits and paracetamol were found in the flat. Jo Hager supplied Peter with hard drugs. Peter used to frequent the local nightclub. Jo was the father of a two-month-old child. Jo's child was in care and had been tested HIV positive. The victim was a compulsive gambler. The victim had bruises on his head.

Question: Neighbours may have seen Jo Hager enter the flat where the victim was found.
Options:
A. true, B. false, C. uncertain
Answer: "A"