<prompt> A person can give valid consent for routine clinical examination if he is above the minimum age of12 years16 years18 years21 years  <response>: Section 90 in The Indian Penal Code Consent known to be given under fear or misconception.--A consent is not such a consent as it intended by any section of this Code, if the consent is given by a person under fear of injury, or under a misconception of fact, and if the person doing the act knows, or has reason to believe, that the consent was given in consequence of such fear or misconception; or Consent of insane person.--if the consent is given by a person who, from unsoundness of mind, or intoxication, is unable to understand the nature and consequence of that to which he gives his consent; or Consent of child.--unless the contrary appears from the context, if the consent is given by a person who is under twelve years of age. Ref - Krishan Vij textbook of forensic medicine and toxicology 5e pg - 370 , 421 