The WHO guideline value for arsenic in drinking water is:

• A 0.05 mg/L (50 μg/L)
• B 0.001 mg/L (1 μg/L)
• C 0.1 mg/L (100 μg/L)
• D 0.01 mg/L (10 μg/L) ✓

Explanation

The WHO guideline value for arsenic in drinking water is 0.01 mg/L (10 μg/L). India's Bureau of Indian Standards (BIS) also specifies 0.01 mg/L as the desirable limit, with a permissible limit of 0.05 mg/L where no alternative source is available. Chronic arsenic exposure through drinking water causes skin lesions (keratosis, Mees' lines), peripheral neuropathy, and increased risk of bladder, lung, and skin cancers.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.