肾结核手术治疗原则，哪项不正确

A．无泌尿男性生殖系统以外活动病灶存在

B．有附睾结核存在不切除病肾

C．手术前足够抗结核药物

D．手术后足够抗结核药物

E．术中尽量保存肾正常组织

Astride entered into a contract with Bild Ltd to construct a wall around the garden of a house she had just purchased. The wall was to be three metres high to block out a view of a rubbish tip. The wall was due to be finished in May and Astride entered into another contract with Chris to landscape the garden starting on 1 June.Bild Ltd finished the wall on 25 May. However when Astride came to examine it for the first time she found that it was only 2·50 metres high and that the rubbish tip was still visible from the top of her garden.On 1 June, Chris informed Astride that he was too busy to landscape her garden and that she would have to get someone else to do it. The only person available, however, will charge Astride ￡500 more than Chris had agreed for doing the work.Required:Analyse the scenario from the perspective of the law of contract, advising Astride:

(b) Whether she can require Chris to undertake the work on the garden, and if not, what alternative action is available to her. (5 marks)