GIVEN BELOW ARE SOME SETS OF ARTHROPODS IN WHICH ONE IS HARMFUL AND ONE IS BENEFICIAL . WHICH ONE OF THE FOLLOWING IS EXCEPTION TO THIS ?
1. APIS , CULEX
2. BOMBYX , ANOPHELES
3. LACCIFER , AEDES
4. PINCTADA , LOCUSTA
4. Pinctada is a genus of marine bivalve molluscs. It is not belongs to Arthropods