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: Unknown
Steroids hormones exert their effects
by binding to 
Select and explain. 
A. Cell surface receptors, B. G proteins, C. Transcription factors, D. Cyclic adenosine monophophate (AMP)
C: Transcription factors
Answer: C: Transcription factors 
Explanation: Steroid hormones cross the cell membrane and bind to specific receptors within the cell. These receptors are transcription factors that are active only in the presence of particular hormones. The hormone-tran­scription factor complex binds to steroid hormone responsive elements in DNA to influence transcription from steroid-sensitive genes. Thyroid hormone, reti­noic acid, and 1,25-dihydroxycholecalciferol exert their effects in a similar way.