What is the covariance of security A to the market given the following information? 
Definitions:
Lactase
An enzyme in the human body that breaks down lactose, a sugar found in milk and dairy products.
Lactose
A sugar that is the primary constituent of fresh milk.
Biological Diversity
Refers to the variety and variability of life forms within a given ecosystem, region, or on the entire planet. It encompasses the diversity of species, their genes, and the ecological complexes they are part of.
Melanin
A pigment found in skin, hair, and eyes that determines color and provides protection against ultraviolet light.
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