Section 88

Nothing, which is not intended to cause death, is an offence by reason of any harm which it may cause, or be intended by the doer to cause, or be known by the doer to be likely to cause, to any person for whose benefit it is done in good faith, and who has given a consent, whether express or implied, to suffer that harm, or to take the risk of that harm.

A, a surgeon, knowing that a particular operation is likely to cause the death of Z, who suffers under a painful complaint, but not intending to cause Z’s death, and intending in good faith, Z’s benefit, performs that operation on Z, with Z’s consent. A has committed no offence.

Penal Code 53

Act done in good faith for the benefit of a child or person of unsound mind, by or by consent of guardian