Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol Has been banned, what still are the sources of lead poisoning ? 1. Smelting units 2. Pens and pencils 3. Paints 4. Hair oils and cosmetics Select the correct answer using the codes given below:
Options
(a)1, 2 and 3 only
(b)1 and 3 only
(c)2 and 4 only
(d)1, 2, 3 and 4
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