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
Frotteurism is - 
Select and explain. 
A. Sexual pleasure is obtained by witnessing the act of urination, B. Sexual gratification by rubbing private parts, C. Sexual practise involving three people, D. None
B: Sexual gratification by rubbing private parts
Answer: B: Sexual gratification by rubbing private parts 
Explanation: None