| During elections, a permanent chemical mark is at the base of the nail of index finger while exercising your franchise. This mark is not seen after months or so because |
(a)The formation of new nail forcibly removes old one  |
| (b)It is gradually oxidised by tannin and caffein that we ingest in tea and coffee respectively |
| (c)It is worn out by constant washing with and water |
| (d)Constant contact of the hands with hard Water corrodes the marks |
