![A massive particle X in free space decays spontaneously into two photons](https://www.gkseries.com/blog/wp-content/uploads/2023/09/A-massive-particle-X-in-free-space-decays-spontaneously-into-two-photons.jpg)
Q. A massive particle X in free space decays spontaneously into two photons. Which of the following statements is true for X?
(A) X is charged
(B) Spin of X must be greater than or equal to 2
(C) X is a boson
(D) X must be a baryon
Ans: X is a boson