This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Knee Ligament Injuries, Subject name: Orthopaedics
Unhappy triad doesn't Include injury to? 
Select and explain. 
A. ACL, B. MCL, C. LCL, D. Medial meniscus
C: LCL
Answer: C: LCL 
Explanation: ANSWER: (C) LCLREF: Netter's Ortopedic Anatomy 1st Ed Ch 8,Yochum & Rowe's Essentials of SkeletalRadiology 3RD Ed Pg 959Indirect repeat Orthopedics 2013 Session 2Twisting force in a weightbearing knee often tears the medial meniscus, causing the well- recognized triad of MCL, ACL and medial meniscal injury described by O'Donoghue. This is known as unhappy triad.