A graft between individuals from different species is called ______.

Correct option is B

A xenograft is a tissue or organ transplant between individuals of different species, such as from an animal to a human. These types of grafts are often studied in organ transplantation research but are not typically used in clinical settings due to immune rejection challenges.
Explanation of each option:
· (a) Autograft – Incorrect. An autograft is a tissue or organ transplant from one part of an individual's body to another part of the same individual.
· (b) Xenograft – Correct. A xenograft is a transplant between different species, such as a heart valve from a pig used in human surgery.
· (c) Allograft – Incorrect. An allograft refers to a transplant between individuals of the same species but genetically different, such as human-to-human transplants.
· (d) Isograft – Incorrect. An isograft is a transplant between genetically identical individuals, such as identical twins.