Which of the following statements is correct?

( If possible kindly explain briefly the points a,b and c)

a) Argentaffin cells produce serotonin
b) Villikinin is secreted by large intestine
c) In cheilosis, deficient nutrient is nicotinamide
d) Bleeding diseases occurs due to deficiency of Vitamin E

Dear Student,
Please find below the solution to the asked query:

Argentaffin cells are located in the gastrointestinal tract. These cells produce a vasoconstricting hormone called serotonin. 
Hence, the correct option is (a)

The small intestine secretes villikinin (hormone) for stimulating the villi movement.
Deficiency of riboflavin causes cheilosis.
Deficiency of vitamin K causes bleeding diseases.

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