Products of Diatoms are Used in Four of the Following

Question

Products of diatoms are used in four of the following.Which one is the exception?  
A) Biofuels
B) Ink
C) Filters
D) Cleaners
E) Insecticides

Accepted Answer

Diatoms are primarily used in biofuels, filters, cleaners, and insecticides due to their unique properties, such as their silica shells. However, they are not commonly used in the production of ink.