患者，女，28岁。3年来妊娠4次，均不足3个月而流产，伴带下清稀，腰部瘦痛，舌淡苔白，脉弱。其证候是（）

A.肾气不固

B.肾精不足

C.肾阳虚

D.肝郁脾虚

E.脾阳虚

Mr. Faugel was convinced that student nervousness had affected their scores; to reduce the anxiety of these students who had already been tested, he gave 22 of them a beta blocker before readministration of the test. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nationwide had average improvements which were similar to those in Faugel’’s non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers.

Where is the only place a person can obtain beta blockers

A．Supermarket.

B．Convenience store.

C．Stationary store.

D．Doctor’s office.