otherwise complex fact-finding process that should have taken place to determine the true cause of the ailment. In Sante v. Employees Compensation Commission,[21] this Court ruled that " a claimant must submit such proof as would constitute a reasonable basis for concluding either that the conditions of employment of the claimant caused the ailment or that such working conditions had aggravated the risk of contracting that ailment. What kind and quantum of evidence would constitute an adequate basis for a reasonable man (not necessarily a medical scientist) to reach one or the other conclusion, can obviously be determined only on a case-to-case basis. That evidence must, however, be real and substantial, and not merely apparent; for the duty to prove work-causation or work-aggravation imposed by existing law is real not merely apparent."   Moreover, petitioner cannot conveniently rely on the invocation that the Employees Compensation Act, as a social legislation, must be liberally construed in favor of the ordinary working person. While the sympathy of the law on social security is toward the employees or their beneficiaries, it is imperative to remember that such compassion must be balanced by the equally vital interest of denying undeserving claims for compensation benefits. Thus, GSIS v. CA[22] held:   x x x [T]here is a competing, yet equally vital interest to heed in passing upon undeserving claims for compensation. It is well to remember that if diseases not intended by the law to be compensated are inadvertently or recklessly included, the integrity of the State Insurance Fund is endangered. Compassion for the victims of diseases not covered by the law ignores the need to show a greater concern for the trust fund to which the tens of millions of workers and their families look to for compensation whenever covered accidents, diseases and deaths occur. This stems from the development in the law that no longer is the poor employee still arrayed against the might and power of his rich corporate employer, hence the necessity of affording all kinds of favorable presumptions to the employee. This reasoning is no longer good policy. It is now the trust fund and not the employer which suffers if benefits are paid to claimants who are not entitled under the law. The employer joins the employee in trying to have their claims approved. The employer is spared the problem of proving a negative proposition that the disease was not caused by employment. Moreover, the new system instituted by the new law has discarded, among others, the concept of "presumption of compensability and aggravation" and substituted one based on