Pharmacologic agent used for pulpotomy are all except:: (A) Formocrsol., (B) Laser., (C) Collagen, (D) Ferric sulphate.
Answer is B. Pharnacologic agents which can be used for pulpotomy in primary teeth are:

Formocresol
Glutaraldehyde
Calcium hy roxi
Collagen
Ferric sulfatee 

Non-pharmacologic  agents

Electrosurgery
Laser therapy.