Correct statements among a to d regarding silicones are: (a) They are polymers with hydrophobic character. (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strength. (d) Usually, they are resistant to oxidation and used as greases.

Silicones are the polymer of silicon-containing [−(R)3Si−O−] linkage. It is a polymer with hydrophobic character thus used in making water-resistant seals. They are biocompatible. They have high thermal stability and low dielectric strength which is not correct. They are also resistant to oxidation. Because of their wax-like texture, they are also used in greases. Hence, the correct option is D.