With no explanation, chose the best option from "A", "B", "C" or "D". Dr. Brewer’s reports addressed the conduct of OGA’s employees, Drs. Jacobs and Gunn, the reports identified Dr. Gunn as OGA’s employee, and McCoy’s original petition alleged that OGA was vicariously liable for the conduct of Jacobs and Gunn under the doctrine of respondeat superior and the requirements of the Texas Professional Association Act. See Troeger v. Myklebust, 274 S.W.3d 104, 110 (Tex.App.-Houston [14th Dist.] 2008, pet. denied) (rejecting claim that conduct of dentist, who was sole defendant, was not implicated because her name was omitted from expert report and holding that dentist waived challenges to expert report by failing to raise objections within twenty-one days after service); Univ. of Tex. Sw. Med. Ctr. v. Dale, 188 S.W.3d 877, 879 (Tex.App.-Dallas 2006, no pet) (<HOLDING>). In response, OGA disputes that its conduct

A: holding that medical center was not required to be named in expert report addressing its residents conduct because plaintiffs alleged no directliability claims against it and noting that medical center was implicated in report and so waived all its objections when it failed to object to sufficiency of report within twentyone days after service
B: holding that causation section of expert medical report was not eonclusory when read in context of entire report
C: holding expert report requirement fulfilled in claim against nurse by providing expert report of nurse as to standard of care and expert report of medical doctor as to causation
D: holding that expert report addressing hospitals conduct was not required when plaintiffs sole theory against hospital was vicarious liability based on ostensible agency and explaining that the conduct by the hospital on which the agency relationship depends is not measured by a medical standard of care these are principles of agency law on which no expert report is required
A.