This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
Which of the following deals with section 377, I.P.C? 
Select and explain. 
A. Unnatural sex offences, B. Rape, C. Incest, D. Adultery
A: Unnatural sex offences
Answer: A: Unnatural sex offences 
Explanation: Voluntary sexual intercourse against the order of nature with any man, woman, or animal is an unnatural sexual offence (Section 377 I.P.C). Penetration is sufficient to constitute the offence. These offences are punishable with imprisonment for life or upto ten years and also with fine. Ref: The Essentials of Forensic Medicine and Toxicology, 27th edition, Page 363.