Table: f1_1986_season
Columns: entrant
constructor
chassis
engine
tyres
driver
rounds

Question: What is the name of the entrant with a chassis of m185b m186?
SQL: SELECT "entrant" FROM f1_1986_season WHERE "chassis" = 'm185b m186'

Question: How many rounds have a chassis of thl2?
SQL: SELECT "rounds" FROM f1_1986_season WHERE "chassis" = 'thl2'