Bring out the only correct statement in context with Uranium: 
[A] Both U-235 and U-238 are fissile but only U-235 can sustain chain reactions
[B] Only U-235 is fissile and can sustain chain reaction but U-238 is fertile
[C] U-238 can be used in chain reactions only after extracting U-235 from it
[D] Uranium enrichment is a process where concentration of U-238 is increased using some chemical processes

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