Will mentally retarded people accumulate karmaphala?

Question: I am mailing this question on behalf of a few of the seekers from our Gita study group. We had a doubt while discussing on Gita Chapter 4 Slokas 18-22, as it clearly says any body does physical work without attachment, without expectations on end result, without any jealousy and competition, never accumulate any Karmaphala. If that is the case, what is the effect of actions of mentally retarded people? If they do some good or bad in their actions will they accumulate any karmaphala?
Please enlighten us on this.

Answer: According to scriptures, the mentally retarded people only exhaust their Prarabdha Karma & usually no Karma Phala is accumulated for them.