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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 code given below

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 code given below:

(a)

1, 2 and 3 only

(b)

1 and 3 only

(c)

2 and 4 only

(d)

1, 2, 3 and 4

Explanation

Lead poisoning sources include lead-based paints and lead smelting units. Pens and pencils and hair oils are not significant sources of lead poisoning.