Tracy suffered from chicken pox in her childhood. at the age of 25, she gets it again. however, this time she recovers with minimal treatment or medication. this was possible due to the (antibody, memory, immune) cells produced by the (acquired, innate, adaptive) immune response.

The answer is  Antibody , adaptive  

The body's natural defence system which fight against the infection is called immune system. The immune system keeps record in the form of white blood cells, namely B-cell and T-cell for every microbe they have defeated after first attack. These cells are called memory cells. Memory cells recognizes the microbe which tries to enter the body.  The microbe gets destroyed by producing antibody. This type of immune response is called adaptive immune response.      

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