Metallurgy

A compound A is used in paints instead of
salts of lead. Compound A is obtained when a
white compound B is strongly heated.
Compound B is insoluble in water but
dissolves in NaOH solution forming a
solution of compound C. The compound A on
heating with coke gives a volatile metal D
and a gas E which burns with a blue flame.
Identify the possible species D and C can be
respectively?