● At the village level, there are sub-health centres where there is usually a nurse and a village health worker. They are trained in dealing with commonillnesses. Hence, Option 1 is correct . ● They work under the supervision of doctors at the Primary Health Centre (PHC) which is next in the hierarchy. Such a centre covers many villagesin a rural area . ● At the Block level , there is usually a Community Health Centre with more facilities than at PHC. ● At the district level is the District Hospital that also supervises all the health centres