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: Biochemistry
Which of following coenzyme is not a part of Pyruvate Dehydrogenase Complex? 
Select and explain. 
A. Lipoic Acid, B. FAD, C. Thiamine pyrophosphate, D. Vitamin B3
C: Thiamine pyrophosphate
Answer: C: Thiamine pyrophosphate 
Explanation: PDH complex consist of 3 Enzymes and 5 Coenzymes.
Three enzymes are:

Pyruvate  Dehydrogenase
Dihydrolipoyl Transacetylase, the prosthetic group is oxidised Lipomide
Dihydrolipoyl Dehydrogenase, contains FAD.
Coenzymes 
Lipoic acid 
Coenzyme A
FAD
NAD ++
Thiamin Diphosphate

Harper 30th edition Pg- 169-175