sentence: Aruzi Samarqandi describes how before Avicenna left Khwarezm he had met Al-Biruni -LRB- a famous scientist and astronomer -RRB- , Abu Nasr Iraqi -LRB- a renowned mathematician -RRB- , Abu Sahl Masihi -LRB- a respected philosopher -RRB- and Abu al-Khayr Khammar -LRB- a great physician -RRB- .
question: who was _ philosophizing _ _ _ ?
answers: Abu Sahl Masihi a respected philosopher