This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Drugs, Subject name: Medicine
Phocomelia is caused by ingestion of ------ during pregnancy: 
Select and explain. 
A. Steroids, B. Tetracycline, C. Thalidomide, D. Barbiturates
C: Thalidomide
Answer: C: Thalidomide 
Explanation: Ans: cRef: Harrison, 15th ed, p. 1038