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The major obstacle in transplantation of organs is that the recipient body does not accept the donor’s organ. The body defence mechanism rejects and treats the transplanted organ as a foreign particle and reacts actively.

1. The major obstacle in transplantation of organs is rejection by the recipient body.
2. The body defence mechanism rejects the transplanted organ as a foreign particle.
3. The recipient body does not accept the donor’s organ.
4. None of the above.

Correct answer: The major obstacle in transplantation of organs is rejection by the recipient body.

Solution

The passage explains that the key problem in organ transplantation is the recipient’s immune rejection of the donor organ. Option A captures this central idea best, while the others mention only parts of the explanation.

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