Which vitamin is synthesized by microbes in the intestine and to maintain bone health? vitamin a vitamin d vitamin e vitamin k

The correct option is VITAMIN K.
Vitamin K is majorly synthesized by micro organisms [bacteria] in the large intestines. Dietary sources of vitamin K include: photosynthetic green part of plants such as green leafy vegetables, cereals and also liver, fish, meat and egg.  

Bis the correct answer.