All of the following are true about coronary artery, except:

All of the following are true about coronary artery except:

A. Right coronary artery lies in right anterior coronary sulcus
B. Left anterior descending artery is a branch of left coronary artery
C. Usually 3 obtuse marginal arteries arise from the left coronary artery
D. In 85% of cases, posterior descending interventricular artery arises from right coronary artery

Answer is C. Usually 3 obtuse marginal arteries arise from the left coronary artery

Only a single obtuse marginal artery arises from the left coronary artery and not three as stated in the option.

The right marginal artery is an acute marginal artery.

Posterior descending interventricular artery is a branch of the right coronary artery in 90% of cases as compared to 10% of cases which is replaced by left coronary artery.