"Problem village" include all EXCEPT:: (A) Where no water source in a distance of 1.6 km from community, (B) Water is available at a depth of more than 15 metres, (C) There is excess of Na+, iron & fluoride salt, (D) Risk of Guinea worm infection
Answer is D. - A "problem village" has been defined as one where No source of safe water is available within a distance of 1.6 km, or where water is available at a depth of more than 15 metres, or where water source has excess salinity, iron, fluorides and other toxic elements, or where water is exposed to the risk of cholera.