- Sodium plumbite
- Sodium sulphite
- Sodium thiosulphate
- Lead sulphate
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Four friends A, B, C, and D, who are from different families, meet at a party. One of them is the doctor
A says, " B is a doctor".
B says, "I am a doctor."
C says, "D lies."
D says, "B lies."
If only one of them is laying, then find out who the doctor is.?
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