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: Pathology
Which of the following pathway is seen in basal cell carcinoma 
Select and explain. 
A. mTOR, B. Sonic Hedgehog, C. WNT, D. RAS
B: Sonic Hedgehog
Answer: B: Sonic Hedgehog 
Explanation: Answer- B. Sonic HedgehogBasal cell carcinomaLocally aggressive tumorAssociated with mutations which activate Hedgehog pathway signalling.Gorlin syndrome is associated with gene PTCH, a tumor suppressor genePTCh is receptor for Sonic hedgehog, which determines polarity during embryonic development.Basal cell carcinoma presents as pearly papules.