(A) Any kind of exchange force helps the nucleus to be more destabilised. (R ) `pi`-mesons are exchanged between nucleons incessantly.

(A) Any kind of exchange force helps the nucleus to be more destabilised. (R ) `pi`-mesons are exchanged between nucleons incessantly.
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(A) Any kind of exchange force helps the nucleus to be more destabilised. (R ) `pi`-mesons are exchanged ... D. If both (A) and (R ) are incorrect.
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